NewDiesel Mechanic United RentalsDiesel MechanicSan Lorenzo, CA$25.30–$49.90 / hourEvery day, you can improve and challenge yourself, and if you have the desire and ambition, you'll have the potential to work towards higher levels of Service Technician and leadership roles in our Service Department. We're an award-winning company (recently named a Glassdoor Best Place to Work in 2026) that truly cares about our people - That's why we offer best-in-class benefits and perks that will support you and your family.
Diesel Mechanic - Experienced United RentalsDiesel Mechanic - ExperiencedSan Jose, CA$28.45–$49.90 / hourAs a Diesel Mechanic - Experienced (Service Tech IV), you'll use your skills to perform maintenance and repairs of complex equipment with limited or no supervision in a highly skilled, safe, and professional manner. Maintenance and repair of complex mechanical, electrical, hydraulic, and diesel systems on a variety of rental and customer equipment and tools while using a high degree of independent judgment.
Field Diesel Mechanic United RentalsField Diesel MechanicSan Jose, CA$25.30–$49.90 / hourAs a Field Diesel Mechanic (Service Tech IV - Field Service), you'll use your skills to perform maintenance and repairs of complex equipment with limited or no supervision in a highly skilled, safe, and professional manner. Maintenance and repair of complex mechanical, electrical, hydraulic, and diesel systems on a variety of rental and customer equipment and tools while using a high degree of independent judgment.
NewDiesel Mechanic US Foods, Inc.Diesel MechanicDanville, CAIndependently troubleshoot, diagnose, rebuild, replace, and complete all required repairs on diesel equipment (i.e., tractors, trailers, bobtails, reefers, lift gates, etc.). Excellent communication skills; able to communicate with co-workers and drivers with demonstrated teamwork skills.
NewDiesel Mechanic *NOW HIRING* US Foods, Inc.Diesel Mechanic *NOW HIRING*Dublin, CAHand truck, boxes, cartons, steering wheel) Boxes, dolly, metal truck ramp, hand truck, paperwork, truck gate, straps) Typing, use of office machines such as copiers, printers) The expected base rate for this role is between $40-$42 per hour. Valid Class A CDL license and DOT certification 1 (Push/Pull: Hand truck, gate, straps, metal ramp, truck door, dolly, boxes, truck gear shift) In/Out Truck/Trailer to cab.
60385 Automotive Technician - Mid Level Stoneridge Chrysler Jeep Dodge Of Dublin60385 Automotive Technician - Mid LevelDublin, CAFull timeAutomotive Technician Stoneridge Chrysler Jeep Dodge Of Dublin is looking for Mid-level Automotive Technicians to join their industry leading Service Team! Able to explain mechanical problems and needed repairs to Service Advisors and vehicle owners in a non-technical manner.
45558 Master Automotive Technician Covert Chrysler Dodge Jeep Ram45558 Master Automotive TechnicianSan Francisco, CAFull timeMaster Certified Technician / Automotive Mechanic Covert Chrysler Dodge Jeep Ram is looking for Certified Master Technicians to join their industry leading Service Team! Diagnose, maintain, and repair vehicle automotive systems including engine, transmission, electrical, steering, suspension, braking, air conditioning, etc.
Mechanic Level B MV TransportationMechanic Level BSouth San Francisco, CA$40.82As a Mechanic B, you will perform preventative maintenance, diagnosis, service and repair of steering, suspension, brakes, engines, transmissions, differentials, electrical, wheelchair lifts, and air conditioning systems. Combination of at least two (2) to three (3) years of apprentice level verifiable training and experience in automotive or diesel mechanics, which may include high school mechanics courses and/or a regional occupational program.
Mechanic Level C MV TransportationMechanic Level CUnion City, CA$34.42As a Mechanic, you will perform preventative maintenance, diagnosis, service and repair of steering, suspension, brakes, engines, transmissions, differentials, electrical, wheelchair lifts, and air conditioning systems. Combination of at least one (1) to two (2) years of apprentice level verifiable training and experience in automotive or diesel mechanics, which may include high school mechanics courses and/or a regional occupational program.
NewRide Mechanic California's Great AmericaRide MechanicSanta Clara, CA$34.50–$44 / hourQualifications: Requires a vocational diploma in mechanical/industrial maintenance supplemented by a minimum of one year of experience in mechanical maintenance for a Level 1 Ride Mechanic, or an equivalent combination of education, training and experience that provides the required knowledge, skills and abilities. See Cedar Fair Terms & Conditions at https://www.sixflags.com/terms-of-use and Privacy Policy at https://www.sixflags.com/privacy-policy and SonicJobs Privacy Policy at https://www.sonicjobs.com/us/privacy-policy and Terms of Use at https://www.sonicjobs.com/us/terms-conditions.
27086 Chrysler Automotive Technician Boardwalk Chrysler Dodge Jeep Ram27086 Chrysler Automotive TechnicianRedwood City, CAFull timeDiagnose and repair vehicle automotive systems including engine, transmission, electrical, steering, suspension, braking, air conditioning, etc. to specification. Boardwalk Chrysler Dodge Jeep Ram of Redwood City is hiring Level 3 Chrysler Certified Technicians to join our family owned and operated dealership !
60385 Automotive Technician - Entry Level Stoneridge Chrysler Jeep Dodge Of Pleasanton60385 Automotive Technician - Entry LevelPleasanton, CAFull timeStoneridge Chrysler Jeep Dodge Of Dublin is looking for Express Lane Lube Technicians to join their busy service department! Whether you're a recent technical school graduate or an experienced oil change master, we offer a chance to kick-start your career in automotive repair!
60518 Automotive Service Technician Stewart Chrysler Jeep Dodge Ram60518 Automotive Service TechnicianSan Jose, CAFull timeWe are also looking for entry level technicians (lube technician): primary responsibilities will be to perform maintenance on vehicles (oil changes, fluid services, tire rotation, tire replacements, etc) and perform new vehicle inspections. Stewart Automotive Group currently has an opening for an Automotive Mechanic and is looking for someone who is willing to grow in their automotive career.
Power & HVAC Mechanic United RentalsPower & HVAC MechanicHayward, CA$25.30–$40.45 / hourAs a Power HVAC Mechanic (Service Tech II) within the Power/HVAC division at United Rentals, you'll use your skills to perform maintenance tasks as well as minor repairs on equipment in a safe and professional manner. We're an award-winning company (recently named a Glassdoor Best Place to Work in 2026) that truly cares about our people - That's why we offer best-in-class benefits and perks that will support you and your family.
NewRefrigeration Fleet Mechanic US Foods, Inc.Refrigeration Fleet MechanicHayward, CATroubleshoot, diagnose, rebuild, replace and complete all required repairs on diesel reefer equipment (THERMO KING & CARRIER TRAILER REFRIGERATION SYSTEMS, Reefer Microprocessors, etc.). Benefits for this role may include health insurance, pre-tax spending accounts, retirement benefits, paid time off, short-term and long-term disability, employee stock purchase plan, and life insurance.
NewJourneyman Shop Technician / Mechanic Pape' Machinery, IncJourneyman Shop Technician / MechanicFremont, CA$54.16As a Journeyman Shop Technician, you will work on construction and forestry equipment in the shop ensuring equipment repairs are done accurately and timely, all in an effort to support our customers and maximize their uptime. Every day, picture yourself working alongside other trained Technicians in a shop that has all the support and resources you need to perform top-notch work on equipment.
NewRefrigeration Mechanic KellanovaRefrigeration MechanicMenlo Park, CA$40.16–$50.54Preventative Maintenance & System Reliability – Perform inspections, troubleshooting, repairs, and preventative maintenance on primarily facility systems and ammonia refrigeration systems to ensure safe and reliable operations. Troubleshooting & Repairs – Diagnose and repair mechanical, hydraulic, pneumatic, and refrigeration-related issues, replacing components such as motors, pumps, valves, compressors, and other system parts.
NewSFO GSE Mechanic Swissport International AGSFO GSE MechanicBurlingame, CA$33–$43Fleet Mechanic is responsible for service and maintenance, keeping in good order all Ground Service Equipment at a designated station, keeping Swissport Ramp and other service agencies safe with reliable equipment that meets all local and governing laws. As a global leader in aviation services, Swissport provides Ground Handling, Cargo Handling, and Passenger Services to over 300 million passengers annually.
NewMobile Diesel Mechanic/Technician (2011) Kooner Fleet Management SolutionsMobile Diesel Mechanic/Technician (2011)Newark, CAWith nearly a decade of industry experience, Kooner FMS helps fleets reduce downtime , extend vehicle life, and simplify operations through proactive maintenance programs and advanced technology . Geared up with your own, fully equipped company service truck , top-tier tools, and a supportive team that values your skill, drive and dedication , you’ll tackle new challenges every day and take pride in delivering safe, reliable and efficient service that keeps America moving.
Automotive Technician/Mechanic â Fun Place to Work Mechanics & Body Shops MarketplaceAutomotive Technician/Mechanic â Fun Place to WorkSan Jose, CaliforniaRelated keywords: mechanic, automotive technician, automotive, diesel mechanic, transmission specialist, automotive mechanic, auto tech, ASE, A.S.E., car repair, auto repair, ase tech, A technician, automotive careers, automotive jobs, B tech, A tech, B-Level technician, smog, smog check repair . Reputable and clean auto repair business in San Jose CA is looking to hire a certified Smog Check Repair technician.
Diesel Mechanic - Fleet Technician A Reyes Fleet ManagementDiesel Mechanic - Fleet Technician ASan Jose, California$46–$51 / hourFull timeThis position may require driving Reyes Family of Businesses, Reyes Fleet Management and customer vehicles, it is regulated by the DOT and requires a current driver qualification file to be maintained as required by the role. The Driver Qualification file includes: an annual motor vehicle records (MVR) check, a successfully completed DOT Physical, and Safety Performance History records request from prior employers in the last three years.
Journeyman Tractor Trailer Mechanic $1500 Sign on Bonus Waste Management IncJourneyman Tractor Trailer Mechanic $1500 Sign on BonusSan Leandro, CAWM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America. Required to exert physical effort that will include but is not limited to frequent lifting, pushing, pulling, crouching, and climbing; Constantly standing, walking, and grasping; Occasionally: sitting and balancing.
Diesel Mechanic Fleet Technician A Reyes Holdings LLCDiesel Mechanic Fleet Technician ASan Jose, CA$46–$51 / hourThis position may require driving Reyes Family of Businesses, Reyes Fleet Management and customer vehicles, it is regulated by the DOT and requires a current driver qualification file to be maintained as required by the role. At the Reyes Family of Businesses, our Total Rewards Strategy prioritizes the holistic well-being of our employees, and our compensation philosophy embraces diverse factors for fair pay decisions, valuing skills, experience, and the needs of our business.
Diesel Equipment Mechanic with F.D. Thomas, Inc. ASRC Industrial Services LLCDiesel Equipment Mechanic with F.D. Thomas, Inc.Oakland, CA$40–$55 / hourThomas we play a critical role in supporting essential overnight operations on the Oakland Bay Bridge and were seeking an experienced Diesel Equipment Mechanic to help keep our heavy equipment and support vehicles operating safely reliably and efficiently in a demanding high‑risk environment. This role is ideal for a mechanic who thrives in fast‑paced field conditions, understands preventative maintenance and diagnostics for diesel‑powered equipment, and takes pride in keeping mission‑critical assets running during complex overnight operations.
Diesel Equipment Mechanic with F.D. Thomas, Inc. ASRC IndustrialDiesel Equipment Mechanic with F.D. Thomas, Inc.Oakland, CA$40–$55 / hourFull timeThomas , we play a critical role in supporting essential overnight operations on the Oakland Bay Bridge , and we're seeking an experienced Diesel Equipment Mechanic to help keep our heavy equipment and support vehicles operating safely, reliably, and efficiently in a demanding high‑risk environment. This role is ideal for a mechanic who thrives in fast‑paced field conditions, understands preventative maintenance and diagnostics for diesel‑powered equipment, and takes pride in keeping mission‑critical assets running during complex overnight operations.
Diesel Mechanic Rockstar RecruitingDiesel MechanicOakland, CaliforniaThis role involves performing daily maintenance on our fleet, including preventative maintenance and minor to major repairs for Class A trucks, trailers, and forklifts. Diesel engine experience is required, and experience with trailer maintenance, overhead doors, lift gates, dollies, welding, and forklift repairs is preferred.
Diesel Mechanic US Foods Holding CorpDiesel MechanicLivermore, CA$40–$42 / hourAble to read and write legibly (e.g., to attend trainings, hold conversations, receive safety and job-related coaching, and enter information on reports if needed); basic mathematical skills (add, subtract, divide). Troubleshoot, diagnose, rebuild, replace and complete all required repairs on diesel equipment (i.e., tractors, trailers, bobtails, lift gates, etc.).
Diesel Mechanic CalPortland Co IncDiesel MechanicSan Jose, CA$48–$53 / hourPhysical Requirements: climbing, stooping, bending, squatting, twisting, pushing, pulling, frequent lifting of 50 pounds, occasional lifting of 75 to 100 pounds, stretching, driving/sitting, using pneumatic and power tools. The Diesel Mechanic is responsible for safely and properly repairing commercial trucks and various equipment in the repair shop setting and out on road calls.
NewAutomotive Technician/Mechanic Amerit Fleet Solutions IncAutomotive Technician/MechanicFremont, CA$37–$45 / hourTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.
Automotive Technician/Fleet Mechanic Amerit Fleet Solutions IncAutomotive Technician/Fleet MechanicSanta Clara, CA$36–$42 / hourTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.
NewSenior Diesel Mechanic PrimeFlight Aviation - USASenior Diesel MechanicSan Jose, CA$43–$45 / hourSpecific vision abilities required for this job include: Close vision (clear vision at 20 inches or less); distance vision (clear vision at 20 feet or more); peripheral vision (ability to observe an area that can be seen up and down or to the left and right while eyes are fixed on a given point); depth perception (three-dimensional vision, ability to judge distances and spatial relationships); ability to adjust focus (ability to adjust the eye to bring an object into sharp focus). The GSE Mechanic Level III is responsible for performing advanced maintenance and repairs on both motorized and non-motorized airline and aircraft ground support equipment.
Mobile Automotive Technician/Mechanic Amerit Fleet SolutionsMobile Automotive Technician/MechanicSouth San Francisco, California$32–$50 / hourFull timeTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.
Diesel Mechanic/Technician I - Experienced Penske CorporationDiesel Mechanic/Technician I - ExperiencedSouth San Francisco, CAWillingness to travel as necessary within the district (customers' yards, close geographical area and training sites), work the required schedule, work at the specific location required, complete Penske employment application, submit to a background screening (to include criminal checks, past employment and education) and pass a drug screening. Penske Truck Leasing/Transportation Solutions is a premier global transportation provider that delivers essential and innovative transportation, logistics and technology services to help companies and people move forward.
Automotive Fleet Technician/Mechanic Amerit Fleet SolutionsAutomotive Fleet Technician/MechanicSan Mateo, California$35–$46.50 / hourFull timeTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.
Mobile Diesel Mechanic - 6AM - 3PM shift Epika Fleet Services, Inc.Mobile Diesel Mechanic - 6AM - 3PM shiftSan Leandro, California$29–$36 / hourFull timePerform repairs and inspections on a variety of Class 6-8 trucks and trailers, such as brakes, diagnostics, A/C systems, electrical systems, engine components, exhaust systems, after-treatment systems, lift-gates, tires, etc. On-Site Truck and Trailer Maintenance and Repairs : Our mobile repair experts come to you, performing all maintenance and repairs at your location and around your schedule.
NewFleet Mechanic FiberTel, LLCFleet MechanicSan Jose, California$30–$50 / hourFull timeThe employee will need to have the ability to stand for long periods of time (up to 12 hours at a time), tolerate work in extreme weather conditions, speak and hear worksite safety instructions, withstand prolonged and repeated: lifting, standing, climbing, kneeling, reaching and feeling, crouching, and crawling. About Us: A fully owned subsidiary of Quanta Services, Inc. (NYSE: PWR), FiberTel, LLC. is locally grown in Utah’s Art City and has rapidly expanded over the Northwest and Western regions.
NewFleet Mechanic Quanta Services IncFleet MechanicSan Jose, CA$30–$50 / hourPhysical Requirements: The employee will need to have the ability to stand for long periods of time (up to 12 hours at a time), tolerate work in extreme weather conditions, speak and hear worksite safety instructions, withstand prolonged and repeated: lifting, standing, climbing, kneeling, reaching and feeling, crouching, and crawling. A fully owned subsidiary of Quanta Services, Inc. (NYSE: PWR), FiberTel, LLC. is locally grown in Utah's Art City and has rapidly expanded over the Northwest and Western regions.
Mobile Diesel Mechanic - 6AM - 3PM shift Prestige Fleet ServicesMobile Diesel Mechanic - 6AM - 3PM shiftSan Leandro, California$36–$42 / hourFull timePerform repairs and inspections on a variety of Class 6-8 trucks and trailers, such as brakes, diagnostics, A/C systems, electrical systems, engine components, exhaust systems, after-treatment systems, lift-gates, tires, etc. On-Site Truck and Trailer Maintenance and Repairs : Our mobile repair experts come to you, performing all maintenance and repairs at your location and around your schedule.
Fleet Technician/Mechanic Amerit Fleet Solutions IncFleet Technician/MechanicSanta Clara, CA$33–$40 / weekTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.
Diesel Mechanic | Overnight Shift | Sun-Wed ABC Bus Companies, Inc.Diesel Mechanic | Overnight Shift | Sun-WedCA$37–$65 / hourABC Companies is a leading provider of transportation solutions, offering vehicles for 8-81 passengers, along with parts, service, and financing to support fleet operators across North America. Guided by its core values of Integrity, Trust, Collaboration, and Innovation, ABC is committed to delivering customer-focused, high-quality solutions that enhance safety, performance, and reliability.
Automotive Technician/Mechanic â Benefits & Stable Income Mechanics & Body Shops MarketplaceAutomotive Technician/Mechanic â Benefits & Stable IncomeSan Francisco, CaliforniaDo you want a great job and career with a stable income doing what you love to do and surrounded by great automotive technicians to help you when needed? If you donât absolutely love your job or if you are unsure if the grass is greener on the other side of the fence, come down for a no-strings attached tour of our shop and weâll answer any questions you may have.
Lead Mobile Diesel Mechanic Cox AutomotiveLead Mobile Diesel MechanicOakland, CaliforniaDiagnose, adjust, and repair various types of truck equipment including, but not limited to the following: Electrical/Brake/Cooling Systems, Starters/Alternators, Air conditioning systems, Fan clutches, Engine electronics, Diesel steering systems, Engines (gas and diesel), Transmissions (manual and automatic), Clutches, Differentials, etc. Perform minor adjustment and repairs on various types of truck equipment including, but not limited to the following: Electrical/Brake/Cooling Systems, Starters/Alternators, Fan clutches, Engine electronics, Diesel steering systems, Engines (gas and diesel), Transmissions (manual and automatic), Clutches, Differentials, etc.
Fleet Mechanic- Sr US Foods Holding CorpFleet Mechanic- SrLivermore, CA$40–$42 / hourSIT Occasionally 2. STAND Frequently 3. WALK Frequently 4. DRIVE Occasionally (Test drives equipment) TO LIFT: 1. 1-10 lbs (Sedentary) Continuously 2. 10-20 lbs (Light) Frequently 3. 25-50 lbs (Medium) Occasionally 4. 50-100 lbs (Heavy) Occasionally 5. Over 100 lbs (Very Heavy) May lift up to 120-150 pounds (2 man lift) TO CARRY: 1. 1-10 lbs (Sedentary) Frequently 2. 10-20 lbs (Light) Frequently 3. 25-50 lbs (Medium) Occasionally 4. 50-100 lbs (Heavy) Occasionally 5.
Automotive Technician / Mechanic Moto VisionsAutomotive Technician / MechanicSAN RAMON, CAThe responsibilities include, but not limited to: · observe safety regulations and practices, · perform and complete work in a clean manner, · ensure the shop remains orderly and safe, · absorb direction to understand and achieve customer requirements, · perform vehicle diagnostic procedures, repairs and upgrade installations without oversight, · tune engines and suggest performance upgrades to optimize performance, · repair vehicles independently while also working well in a team environment and mentoring others, · possess own tools, · have a Valid Drivers License. Automotive Technician / Mechanic – This position is the top technician of our mechanic team with a focus on diagnostic, repair, performance enhancements and clean installs.
Journey Level Mechanic Alameda-Contra Costa Transit DistrictJourney Level MechanicOakland, CA$92,248–$102,502 / yearEducation & Training: Equivalent to completion of the 12th grade, plus EITHER successful completion of all eight (8) levels of the Districts state certified four (4) year Apprentice Training program, as determined by assessment at each level; OR verified completion of an external two (2) year training program in automotive or heavy-duty truck maintenance and repair from an accredited trade or vocational school. Diagnoses, examines, and investigates vehicles to determine causes of defective operation of engines, transmissions, differential units, generators, starters, pumps, air suspension systems, pneumatic systems, passenger lift assemblies, radiators, injectors, clutches, air conditioning systems, and other vehicle components.
**Master Mechanic/Technician Job for New Leader in Auto Repair** YourMechanic**Master Mechanic/Technician Job for New Leader in Auto Repair**Oakland, California$2–$3 / hourWe handle all the marketing, appointment scheduling, parts ordering, invoicing and customer support for our mechanics, leaving the mechanics to do what they love- fix cars. WORK DIRECTLY WITH CUSTOMERS: Get to know your customers, speak to them directly about repairs, and show them what a great experience auto repair can be.
***Master Mechanic/Technician Job for New Leader in Auto Repair*** YourMechanic***Master Mechanic/Technician Job for New Leader in Auto Repair***Oakland, California$2–$3 / hourWe handle all the marketing, appointment scheduling, parts ordering, invoicing and customer support for our mechanics, leaving the mechanics to do what they love- fix cars. WORK DIRECTLY WITH CUSTOMERS: Get to know your customers, speak to them directly about repairs, and show them what a great experience auto repair can be.
Journeyman Diesel Mechanic OAK HARBOR FREIGHT LINES, INC.Journeyman Diesel MechanicNewark, CAJoin the Oak Harbor Freight Lines family, where success and tradition meet in a regional trucking story spanning over a century. Diagnose mechanical and electrical problems using appropriate diagnostic tools and software to determine necessary repairs.
NewDiesel Mechanic CalportlandDiesel MechanicSan Jose, CA$48–$53 / hourPhysical Requirements: climbing, stooping, bending, squatting, twisting, pushing, pulling, frequent lifting of 50 pounds, occasional lifting of 75 to 100 pounds, stretching, driving/sitting, using pneumatic and power tools. The Diesel Mechanic is responsible for safely and properly repairing commercial trucks and various equipment in the repair shop setting and out on road calls.
Fleet Mechanic Amerit Fleet Solutions IncFleet MechanicSan Mateo, CA$30–$37.50 / hourTechnicians must be able to perform essential job functions that include frequent movement such as standing, walking, climbing, bending, and sitting for extended periods, as well as lifting heavy objects and accessing tight or confined spaces. This role involves working in a mobile, outside and/or shop environment with exposure to dust, diesel fumes, noise, and mechanical materials such as oils and greases.