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Is Adding ATF to Motor Oil Good Advice?
 
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Question:
Is Adding ATF to Motor Oil Good Advice?
I have seen this advice before, and I have been following it for years. The advice is to add one quart of ATF to the engine oil every change. Would you please tell me if this right or wrong?
-- Suhail Hamamah, Glendale, CA
Answer:
Today’s engine oils are specifically formulated to meet the needs of an engine’s complex operating conditions.  Automatic transmission fluids are designed for a completely different piece of hardware operating with its own unique needs. It is not recommended that these fluids be mixed.
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