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A measure of an oil's thickness and flowability.

The temperature at which an oil releases flammable vapors.

The lowest temperature at which an oil can still flow.

The amount of solid residue left after an oil is burned.

A heat exchanger that removes heat from engine oil. Air-cooled Type 2 engines use an oil cooler in the engine cooling assembly; design and mounting vary by engine. It is distinct from a Vanagon coolant radiator.

A type of additive used to improve the viscosity of an oil.

Switch that monitors low oil pressure in the engine

Switch that monitors high oil pressure in the engine

A combination of additives used to enhance the performance and protection of an oil.

A measure of an oil's resistance to changes in viscosity due to temperature fluctuations.

Engine type where oil is stored in a separate tank, not in the crankcase.

A type of filter that allows oil to bypass the main filter and flow directly to the engine.

Type of low-maintenance battery using oil to reduce acid mist and out-gassing

A synthetic polymer used as a lubricant and anti-wear additive in engine oils

A standardized test procedure for evaluating motor oil performance

A type of driving condition characterized by normal engine temperature, highway speeds, and a clean environment.

A mixture in which particles are suspended in a liquid, used to stabilize PTFE in engine oils

Gaps between the piston rings, which must be offset to prevent oil from entering the combustion chamber