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  2. Gear oil - Wikipedia

    en.wikipedia.org/wiki/Gear_oil

    The viscometrics for gear oils are standardized in SAE J306. Multigrade gear oils are becoming more common; while gear oil does not reach the temperatures of motor oil, it does warm up appreciably as the car is driven, due mostly to shear friction (with a small amount of heat conduction through the bellhousing from the engine block).

  3. NLGI consistency number - Wikipedia

    en.wikipedia.org/wiki/NLGI_consistency_number

    Examples include enclosed gear drives operating at low speeds and open gearing. Grades 0, 1 and 2 are used in highly loaded gearing. Grades 1 through 4 are often used in rolling contact bearings. Greases with a higher number are firmer, tend to stay in place and are a good choice when leakage is a concern.

  4. Viscosity index - Wikipedia

    en.wikipedia.org/wiki/Viscosity_index

    where U is the oil's kinematic viscosity at 40 °C (104 °F), Y is the oil's kinematic viscosity at 100 °C (212 °F), and L and H are the viscosities at 40 °C for two hypothetical oils of VI 0 and 100 respectively, having the same viscosity at 100 °C as the oil whose VI we are trying to determine.

  5. List of gear nomenclature - Wikipedia

    en.wikipedia.org/wiki/List_of_gear_nomenclature

    Total face width is the actual dimension of a gear blank including the portion that exceeds the effective face width, or as in double helical gears where the total face width includes any distance or gap separating right hand and left hand helices. For a cylindrical gear, effective face width is the portion that contacts the mating teeth.

  6. Shell Rotella - Wikipedia

    en.wikipedia.org/wiki/Shell_Rotella

    Tractor fluid (a universal transmission, gear, hydraulic, and wet brake fluid) Gear oil; In the engine oil family, there are four basic oil sub-families: Multigrade conventional oil—in SAE 10W-30 and 15W-40 viscosity ranges; Multigrade synthetic oil—in SAE 5W-40 and 15w-40 viscosity ranges [3] Single grade conventional oil—in SAE 20, 30 ...

  7. SAE J300 - Wikipedia

    en.wikipedia.org/wiki/SAE_J300

    The SAE has a separate viscosity rating system for gear, axle, and manual transmission oils, SAE J306, which should not be confused with engine oil viscosity. The higher numbers of a gear oil (e.g., 75W-140) does not mean that it has higher viscosity than an engine oil 20W-50.

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