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Re: Oil in Coolant
First, the GTP isn't affected by the plenum issues, as it doens't have one. Are you sure it's oil, and not just Dex-Cool sludge?
Second, Dexcool is not the cause of the plenum issues, it's a faulty gasket on the late 99-up Vin-K and an EGR stovepipe heat issue on early 99-back versions.
If it is oil, I would suspect the lower intake gasket on your GTP. GM has come out with a revised metal/rubber version to address the issue with the OEM plastic/rubber design.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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