Originally Posted by myalfa
I have a 89 Mustang, 5.0 bored out to a 306. GT 40 heads and intake with a Paxton Supercharger. I'm running 10w 30 Mobil 1 oil. Last month it needed a quart of oil which isn't the norn.
Now I have engine oil in my radiator. Not the creamy coffee with cream looking stuff, straight brownish black engine oil floating on top of the anti freeze. Yet, theres no anti freeze in the oil in the engine ?
Car runs great with no issues, the plugs are a nice light tan colored and it doesn't smoke or leak.
The symptons aren't really right for a blown head gasket. Was going to pressurize each cylinder with air and see if I get any bubbles in the radiator. It's just strange that I'm not loosing any anti freeze. If oil is getting into the cooling system when it's running, anti freeze should be getting into the oil when you shut it off.
Try to soak up the oil that you can see in the radiator, then leaving the radiator cap off start the car and let it run until the thermostat opens and it begins to circulate the coolant. Look for more oil and bubbles. If you get either, then it is likely you have a head gasket failing.
P.S. I don't think pressurizing the cylinders will work. The engine needs to be hot and most of your air is going to leak past the rings into the crankcase.