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Old 01-10-2019, 10:56 PM
stiubhartach stiubhartach is offline
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The Ďmayoí is water in the oil which then gets whipped into a foam.

The water has two possible sources: leaks from the coolant system into the cylinders or crankcase, and condensation from blowby (passing the rings) exhaust gasses that get purged out of the crank case by hot engine temperature and the CCV system.

Short trips donít get the condensation boiled out of the oil and it can build up and form mayo. Itís a small amount of water.

Leakage from a failing gasket is usually a much larger amount of water. Exhaust gasses usually end up back into the cooling system if itís a leaking head gasket. You can get a test kit that will test for gasses in the cooolant.
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