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Does Inadvertently Adding Transmission Fluid to Oil Cause Problems?
 
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Question:
Does Inadvertently Adding Transmission Fluid to Oil Cause Problems?
What happens if you accidentally add Mobil 1 synthetic transmission multi-vehicle formula to a car that has Mobil 1 oil? Will I screw up the engine? I accidentally added one quart to my car.
-- Kenneth Pettiford, Pomona, CA
Answer:
It is unlikely that you will cause any damage with this mistake, but since the transmission fluid is a light viscosity, you need to check your oil level.  We suggest you change the oil as soon as you get a chance just to be on the safe side.
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