What would cause oil to leak into the coolant system on 1995 Volkswagen Jetta

I have flushed my jetta twice and there still oil in the coolant system. With that I have done thermostat water pump and a few hoses..many people re saying its either the freeze plugs, head gasket, or valve cover gasket

by in Corona, CA on October 05, 2013
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1 answer
ANSWER by , October 05, 2013
What kind of oil is mixing with the coolant,Is it engine oil than u have to check the engine oil cooler and if its transmission oil u have to check the radiator.