[928Guy]

I just repaired a similar problem on my 89'. Mine was a bad radiator. I had lots of oil in the cooling system, but no water in the crankcase. Replaced the radiator, flushed cooling system. Flushed cooling system again with automatic dishwashing detergent (non sudsing). Flushed it again. Then drained and added coolant, distilled water, and redline water wetter. It's all good now. It was a ***** getting all the oil out... But at least I didn't have to pull the motor... Good Luck! The aluminum C&R radiator available at 928Intl is a great choice. Also Mark knows a guy that can fix the oil cooler end tanks for around $160...

Also, there is a way to test the radiator for a oil cooler leak. Use a bicycle innertube. Cut it on the oposite side of the valve stem. Attach the ends of the innretube to the water inlet and outlet. Inflate the innertube slightly. With a stethescope, or a piece of tubing, you can listen to the oil line inlet and outlet for leaking air. You can also submerge the radiator in water and look for bubbles coming from the oil line fittings if you have a kiddie pool or something similar...