Why is there a milky substance on my oil dipstick?

Asked by Aug 15, 2016 at 12:10 PM about the 1999 Honda Accord EX

Question type: Maintenance & Repair

I just replaced the radiator on my car because it had a leak.  My car is still
overheating and losing antifreeze from somewhere even though it is not
leaking anywhere.  I just checked the oil this morning and the dipstick had a
milky substance on it.  Am I getting water in my oil and if so what is the
problem and can I fix it without having to replace the engine.

1 Answer

49,365

It is very likely a bad head gasket or cracked cylinder head. Coolant in the oil will turn it milky brown.

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