See also:

Engine
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Recommended clutch fluid
CAUTION Never use different brands of clutch fluid together. Also, avoid mixing DOT 3 and DOT 4 brake fluids even if they are the same brand. ...

AT OIL TEMP warning light (AT models)
If this light illuminates when the engine is running, it may indicate that the automatic transmission fluid temperature is too hot. If the light illuminates while driving, immediately stop ...