Good news on hearing that there isn't antifreeze into the oil.
There is also the radiator itself is. Maybe it's gunked up (cooling fins are blocked) and needs a flushing.
Do you know if the fans are running?
Just seeing if there is something that can be fix more easily before spending the bucks...
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97 Black Trans Am:
GM847 | Yank SS3600 | MAC Headers | bunch of SLP stuff | some Projectz28 mods | beer
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