Question about 1996 Chevrolet Monte Carlo

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Oil in over coolant tank

I have oil in my coolant overflow tank. I am running green coolant in a car that came with dexcool orange coolant. This is a '96 monte carlo.I have within the past two years had the intake gaskets replaced, water pump, and radiator replaced. Why do I have oil in the coolant overflow tank again? Are the intake gaskets shot again?? Should these need to be replaced again this soon???

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Since you are running green coolant in a car designed for dexcool that may have contributed to a leaky intake gasket and/or head gasket. dexcool was specially formulated to run in the GM vehicles because the gaskets and seals can be easily distorted when the wrong chemicals are soaking them. oil in the coolant is usually either a head gasket or the lower intake manifold leaking into the cooling system. also if the intake gaskets werent done properly that would cause oil in the coolant as well. i suggest you take your car to a reputable shop and have it tested for a headgasket leak and to have the lower intake inspected.

Posted on Feb 17, 2009

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If there is oil inside the coolant liquid that is the head gasket.

Check first if oil can leak into the coolant tank from the cap.

Usually when you get oil into the coolant liquid you have an head gasket problem, do a compression test, or buy the home tester below.

eBay.co.uk Guides - HOW TO TEST FOR A FAILED HEAD GASKET
Head Gasket or Combustion Leak Test Procedure (Gasoline Engines Only)
Blown Head Gasket? how to check

Posted on Feb 17, 2009

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1 Answer

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There are several areas that these cars have issues with coolant leaks first off is this car leaving a puddle of coolant on the ground?

If not check the oil and make sure after it's been run awhile that the oil doesn't resemble chocolate milk if it does then the coolant is leaking internally and could cause sever internal engine damage if not addressed promtly. The engine damage occours due to pitting and rusting in the lifters rod/main and cam bearings, oil and water don't mix. Check the oil after the engine has been run a while since if the car sit's the oil and water will separate and the oil may look ok other then being overfull slightly.

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If this helps please rate me!
You can do it.
Brett

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2 Answers

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