element
relief valve
check valve
case
automatic transmission fluid (ATF)
society of automotive engineers (SAE)
gross vehicle weight (GVW)
American petroleum institute (API)
humidity
temperature
vibration
contamination
appears milky
becomes foamy
turns black
none of these
immediately after the ignition switch is turned off
while the engine is running
a few minutes after the ignition switch is turned off
while the engine is running at high idle speed
The engine oil level should be checked few minutes after the ignition switch is turned off.