Flush out the coolant expansion tank and cooling system, radiator, and engine block with a commercially available cooling system flush (Prestone or any other brand). Refill the cooling system with the correct amount of fresh antifreeze and drive the car after the cooling fans have cycled on and off. When the cooling system has cooled down top up as required and keep an eye on the cooling system for a few weeks to see if the problem reoccurs or if someone had inadvertently put oil in the reservoir, that will answer your question if the engine is good or bad.
February, 14, 2010 AT 6:07 PM
Also if oil is getting in the coolant would it be comming out the exhaust?
February, 14, 2010 AT 9:47 PM
A combustion chamber leak in the cylinder head or block will leak coolant into the cylinder. This dilutes the oil on the cylinder walls and can damage the piston and rings. It can also foul the oxygen sensor and catalytic converter before it comes out of the exhaust. If enough coolant leaks into the cylinder (as when the engine is sitting overnight), it may even hydro-lock the engine and prevent it from cranking when you try to start it. Internal leaks such as these can be diagnosed by pressure testing the cooling system.
A coolant leak into the crankcase is also bad news because it can damage the bearings. Coolant leaking into the crankcase will make the oil level on the dipstick appear to be higher than normal. The oil may also appear frothy, muddy or discolored because of the coolant contamination.
The answer to your question is "yes" but pressure test the system to confirm the problem