Question about Jeep Grand Cherokee

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Oil in the radiator

I have found oil in the water tunk bud the engine temperature is normal and there is not water in the oil of the engine and the transmition

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Check your transmission dipstick for signs of water(antifreeze). The Radiator has 2 compartments, and this is how the transmission gets cooled. If you have not drained the oil from your crankcase, you can always pour the old oil back into the engine after draining it for inspection.

If you are not the original owner, some of the stop-leak products may appear oily. Perhaps a former owner changed a head gasket and you have residual oil in the radiator.

Another thing to try is borrowing a radiator pressure test kit from one of the big autoparts chains. The oil pressure inside a running engine is 30psi to 65psi. But the radiator caps regulate the pressure from about 12psi to 18psi. So you can see that the higher pressure of the oil would overcome the lower pressure of the water.

If you use the pressure tester in the radiator with the engine OFF, you have higher pressure in the radiator than in the resting engine. If the pressurized water flows into the engine, the pressure will drop on the test gauge. When that happens you can remove your sparkplugs and crank the engine.

The antifreeze will blow out the sparkplug holes. To make this easier, invest in chemical dye prior to the pressure test. The kits have uv light and the discharged antifreeze will glow under this uv light.

Posted on Mar 26, 2014

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That is likely coolant that has broken down and appears to be oil but it is not. Remove the tank and flush it out and then flush the entire cooling system.

Posted on Mar 26, 2014

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Oil in the radiator


old post



  1. if you do the service on car, then that is bad. (oil in AF)


  2. if done at JIPHPYboobs. it can be just oil put there.




it will get worse if #1

if #2, go to any real auto shop, ASE shop and get a full flush and fill

to get that gunk out of your engine.

or ask them to do the rad leak down test or exhaust fumes in RAD test.

if all tests pass , its a long distance runner... if not , not.

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1 Answer

Oil into the water tunk but the water temperature is normal


wow no year, GC.
the side coolant water expansion tank.
that means 1 of 3 things.
1: if oil is red/or pink the a/T cooler is ruputured.
2: brown oil is engine, bad head gasket or far worse.
3: Jiffyboobs put oil in the rad. (common there)

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