ill advise a chemical test on the radiator and oil cost about 15 dlls at autozone if u are in the usa ,its designed to show contamination , it will tell you quickly if anything is passing tru, depending on the severity of the "chocolate" or yellowish if you buy the car get a engine block ceramic coating like a k&w ,to be on the safe side ,it will make a coating inside the block and gaskets to prevent any failure.

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If everithing fails try the hammer. obd2? obd2guru.com