Quote:
Originally Posted by GAnOhio
I would love to hear your results.
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We've tried to tell you some ways to analyze what's going on.
Start with an oil sample and send it Blackstone Labs for analysis for sodium and potassium. Those show up in oil from coolant.
The foam on the oil cap is probably just normal moisture and gunk from cold starts.
The least likely is head gasket. You wouldn't be driving it this long because it would have gotten worse.
If you have coolant in oil after oil has couple thousand miles on it and you pull a sample out with a vinyl tube...
Do intake upper manifold, lower gaskets, and coolant return tube on the end of the lower intake metal manifold. You're past due.
There's a possibility you have a radiator crack that opens slightly under pressure and seeps, but you have to get a pressure tester to look for that on a cold motor. You don't seem to want to do that.
And if you are getting seeps through the lower gasket or the throttle body gasket or the coolant ports to the throttle body seals, it might be hard to distinguish.
If you are going to have this done, I'd suggest finding an independent mechanic and buying your own upper manifold, lower gaskets, and GM coolant elbow for the work and paying him well for his time since he won't be raking off a commission selling you poor quality parts from a parts house.
I'm sure folks here will recommend their favorite solution parts for each of those categories.
There are some information threads around the internet with pictures on doing the work yourself if you are a 4 out of 5 wrenches on the do-it-yourself scale.