Quote:
Originally Posted by gasgasman
Probably not the head o-rings. There's no oil "flow" in the head that can migrate to the coolant.
Most likely it's the water pump seal. When the coolant cools off, there's a vacuum effect that can draw trans oil into the cooling system.
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What he said ...
The o-rings are easy enough to change, just loosen your head bolts in a criss-cross, little bit at a time fashion. You can stretch the o-ring slightly if it needs help keeping in the groove, and dab or two of grease can be of assistance as well.
If you had cut an o-ring or somehow caused a failure, you would be pumping into the rads and you would begin to lose coolant. It doesn't sound like that's the case, so ...