Just bought it
SOURCE: oil in the radiator overflow reservoir
either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.
SOURCE: have oil in my radiator fluid reservoir tank (1996 v6 3.8)
Twice in two years now my Saab 9-5 has had a pin-hole in the oil cooler, which has caused oil to flow into the reservoir. A way to tell is if coolant/oil is coming out of the reservoir cap. The reservoir cap is rated for the pressure of the coolant system, which is significantly lower than the oil pressure. When there is a hole in the oil cooler, oil will be forced out at relatively high pressures, causing the reservoir to fill and then over pressurize and spill out of the cap.
SOURCE: My radiator reservoir has oil in it....I just
I would take it back where you bought it and show them, but if you bought it at a private sale, your stuck.
Ten to one it's a blown head gasket.
SOURCE: 2003 PONTIAC GRAND AM GT,
you have most likely blown a head gasket. need to have it inspected and dye tested to make sure. if it is the head gaskets make sure the head is inspected for a crack. hope this helps
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