My son recently had his 89 v-6 engine overhauled(Late Dec. 2005) and about a month ago started getting foam when he removes the engine oil filler cap. He is having to replace radiator fluid about every other day. No other leakage noticed. Took it back to shop and they said engine okay and leakage in heater coil. Not! He has taken it to another shop and they tested for carbon monoxide in radiator fluid, but was not conclusive. He was told to run engine until head gasket blows. Second shop also said repair shops are putting cheap head gaskets in and not the new re-designed thicker head gaskets.
If anyone has information on what is problem, testing procedures, cures, I would sure like to know.
Bill