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Oil in coolant reservois

1995 dakota 6 cylinder, has thick oil in reservois, does not appear to be coolant in oil, heater not working well, probably plugged up with oil-has not heated well for last 2 winters-runs fine otherwise-oil pressure fluctuates, but stays in normal range.Heater worked poorly last winter also, but definitely did not have oil in it then. More noticable this year because of -20 degree temperatures.However. the radiator coolant does not appear to have oil in it, at least not floating-coolant looks normal in radiator.

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  • John Robbins
    John Robbins Jan 07, 2009

    Thanks for replying-I* meant the engine appears to run fine, always starts, runs ok. I do plug in a block heater under 15 degrees. It has never overheated. However, in summer the heater was too hot if you left it on(This is alaska), but in winter wasn;t really warm until rpm reached 1500-2000x-would keep comfortable in 10 degree plus weather, not so well when colder, but this year a lot of 20 below or more, barely tolerable-overdrive off to keep rpms up, and still barely keeping windshield clear ( not always side windows at same time), so I checked coolant to see if it was low-that;s how I noticed the oil, I do check periodically, has not had oil previously, at least not noticeably. It is idling alot right now because it's so cold-maybe breaking down oil prematurely-could thinning oil cause this?

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Hi!
The details you have supplied point to possible head gasket failure, however if as you say 2 Winters and No problems if it were me I would leave well alone as if you flush the system it might make matters worse and overheating could occur.
Failing that can you temporarily by pass the heater matrix/core if it runs fine and stays cool then a flush possibly will return warmth to the interior.
Keep an eye on coolant as although you reckon No oil in radiator it is coming from somewhere and settling in the heater.
Finally this sounds saft but do you let your local service station check/top up your fluids? If so then possibly someone not too clever has popped oil in your coolant by mistake?
Good Luck!
Paul 'W'

Posted on Jan 07, 2009

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