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Old 11-10-2013, 04:04 AM
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Question Need help with coolant issue...

I have a 1986 300sdl diesel in have been trying to find out what the problem could be ,I have noticed I have oil in my coolant in don't have any idea where its coming from no other this issue car runs great with no problems can somebody please help

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Old 11-10-2013, 07:20 AM
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I'll move this thread to the Diesel Discussion, to get you more responses...
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Old 11-10-2013, 07:30 AM
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you may want to include mileage and a bit of lifetime maintenance to help us understand how the car has lived its life.

Oil in the coolant is typically a sign of a failing head gasket, you may also want to check your oil for signs of coolant. Instead of deep black the oil will take on a frothy coffee color and be sludgy.
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Old 11-10-2013, 10:24 AM
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It is important to decide what type of oil you are seeing. It could be engine oil, transmission fluid, or even old fashioned Barr's Leaks which had oil in it to lube the water pump seal. The most likely source of engine oil is a failed head gasket. The most likely source of transmission oil is a leak in the transmission cooler in the radiator.
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Old 11-10-2013, 03:11 PM
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Check for mayonnaise on the underside of the oil filler cap.



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Old 11-10-2013, 08:03 PM
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Quote:
Originally Posted by sixto View Post
Check for mayonnaise on the underside of the oil filler cap.



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I had a small block Chevy engine that had that coating on everything under the valve cover and my heart broke when I saw it.

Phil Forrest

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