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Oil residue in coolant expansion tank – typical sources? 700

posted by  Curtmp on  Sat Apr 10 02:22 CST 2004
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last visit: Sat Jul 10 07:48 CST 2010
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Oil residue in coolant expansion tank – typical sources?

Our 1990 740 turbo, 138,000 miles, has oil in the coolant expansion tank. The volume of oil is small, not a layer of oil on the water, but rather a thick coating of the tank by a very dirty oil. The coolant was flushed and refilled with new coolant in September. The engine oil is clean and free of water.

Are there typical sources for such small amounts of oil?

The only recent problems have been a very rich running engine (poor MPG) and the removal and testing of the temperature sensor for the ECU.

Thanks

Curt





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