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2. Gear oil - Wikipedia

   en.wikipedia.org/wiki/Gear_oil

   GL-5 is not necessarily backward-compatible in synchro-mesh transmissions which are designed for a GL-4 oil: GL-5 has a lower coefficient of friction due to the higher concentration of EP additives over GL-4, and thus synchros can not engage as effectively, unless a specialized friction modifier has been included within the oil's additive ...

3. NLGI consistency number - Wikipedia

   en.wikipedia.org/wiki/NLGI_consistency_number

   The NLGI consistency number is also a component of the code specified in standard ISO 6743-9 “lubricants, industrial oils and related products (class L) — classification — part 9: family X (greases)”. [1] The NLGI consistency number alone is not sufficient for specifying the grease required by a particular application.

4. Extreme pressure additive - Wikipedia

   en.wikipedia.org/wiki/Extreme_pressure_additive

   Methylenebis(dibutyldithiocarbamate) is an additive in some extreme pressure gear oils, serving as an antioxidant and protecting metal surfaces. [1] The early extreme pressure additives were based on lead salts of fatty acids ("lead soaps"), "active sulfur" compounds (e.g. thiols and elementary sulfur), and chlorinated compounds.

5. Automatic transmission fluid - Wikipedia

   en.wikipedia.org/wiki/Automatic_transmission_fluid

   Usually, it is coloured red or green to differentiate it from motor oil and other fluids in the vehicle. This fluid is designed to meet the unique demands of an automatic transmission. It is formulated to ensure smooth valve operation, minimize brake band friction, facilitate torque converter function, and provide effective gear lubrication.

6. 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.

7. NAPA Auto Parts - Wikipedia

   en.wikipedia.org/wiki/NAPA_Auto_Parts

   NAPA retail store in a suburb of Portland, Oregon NAPA Detroit Distribution Center, Romulus, Michigan. The National Automotive Parts Association (NAPA), also known as NAPA Auto Parts, founded in 1925, is an American retailers' cooperative distributing automotive replacement parts, accessories and service items throughout North America.