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Oil is leaking into the coolant system - 2000 Cadillac Catera

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Your Engine has a blown Head Gasket or a Head Gasket leak. The Head Gasket is a Gasket between your Cylinder Head and Engine Block. You will need to remove the Cylinder Head to replace the Gasket. If you decide to get it repaired, it is best to get a few estimates, or take it to your trusted Mechanic.

Posted on Aug 24, 2010

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Why is my 2005 chevy avalanche loose coolant, FAST. I did pressurize the system, but didn't find any leaks. Found TSB from GM about cylinder heads cracking at oil passage issue, but oil is clean.


Coolant can and is lost without getting in the oil from a leaking head gasket or cracked head or block. In the years as a dealer tech most often oil was not in the coolant.

Dec 28, 2016 | Cars & Trucks

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Oil in coolant


Sounds like an intake gasket leak. Oil can leak into the cooling system without coolant leaking into the oil.

Jan 17, 2014 | Chevrolet Uplander LT Cars & Trucks

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Oil leaks with coolant in it


check out the oil cooler for the transmission in the radiator . Have a pressure test done on the coolant system to see if you spot where the leak is from

Jan 03, 2014 | Ford Cars & Trucks

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Antifreeze mixing with the oil


if the oil is mixing in the anti-freeze and it has a red/redish colour to it then the transmission cooler lines in the rad is leaking and the rad will have to be replaced.if the coolant is mixing with the oil then there is a gasket or a crack in the head or block that is allowing coolant into the oil system.it could be an intake gasket that is leaking.it will have to be checked out.there is more oil pressure than coolant pressrure,there fore a gasket will leak into the oil system in an area were an oil passage is not present.

Nov 09, 2011 | 2000 Buick Century

2 Answers

I have oil leaking into cooling system, but no water in the engine. My oil level is dropping. What can cause this and what is the fix?


This is caused by a leaking head gasket. When a head gasket leaks you can get oil in the coolant or coolant in the oil of the engine or both. You will need to pull the cylinder head off, have it checked for cracks and if none are found have it machined flat again and replace the head gasket. Use only a quality head gasket set either from the Toyota dealer or a well known quality brand like Fel-Pro (available from NAPA and others). This is a job that requires some special tools and a great deal of car repair knowledge, time to do the job is about 6 hours.

Oct 18, 2011 | 1990 Toyota Corolla

1 Answer

My engine is overheating my buddy told me it was the lower intake manifold leaking because i had oil in my coolant. i just fixed that and it is still overheating. i turned the heater on and it still did...


COOLANT IN ENGINE OIL CRANK CASE SIGN OF BLOWED HEAD GASKET. HAVE COOLANT SYSTEM PRESSURE TEST FOR LEAKING HEAD GASKET.A GARAGE OR RADIATOR SHOP WILL PRESSURIZE COOLANT SYSTEM CHECK FOR BUBBLES IN RADIATOR AND CHECK FOR COOLANT DRIPPING IN OIL CRANK CASE.

Aug 12, 2011 | 2004 Pontiac Grand Prix

1 Answer

Have very slow water leak.. can not find where it is leaking at . checked oil and it looks milky


milky oil would suggest water has mixed in with it. this added to a slow, unfound water leak points toward a head gasket problem with the coolant escaping from the cooling system, into the oil.
this needs to be sorted out fairly quickly. apart from the obvious problems of a water leak and the risk of overheating, oil with water in it will not lubricate the engine properly and there is a serious risk of engine seizure.
a garage should be able to do a simple test on the oil to discover if it is coolant contaminating the oil.
a pressure test on the cooling system would also confirm where the coolant is being lost.

Mar 30, 2011 | 1995 Pontiac Bonneville

1 Answer

2000 vw jetta 2.0 checked oil no oil showed on dip stick. saw that oil leaked into coolant system. replaced head gasket w/ new head bolts. flushed system, drained oil, new filter. after all done no oil...


Most likely place for oil into coolant is oil cooler, the aluminum box that mounts between the oil filter and a flange that comes off the block.

Jan 10, 2011 | 2002 Volkswagen Passat

2 Answers

Peugot 405 estate diesel turbo n reg


Sounds like a blown cylinder head gasket between the water and oil passages and galleries. Is the amount of oil significant..not just a hint of a film? Do you have any sign of creamy looking 'mayonnaise' on the under side of the oil filler cap and entrance? This would be sign of the reverse i.e. that water had got into the oil. The oil in the engine is driven around the galleries under pressure, certainly more pressure than the coolant, so if there is a connecting leak oil will be forced through it into the coolant. The best way to make sure is to have your coolant system pressure checked by you local garage when the engine is really cold. With the engine off and the oil filler cap removed a leak will be indicated by the coolant pressure dropping slowly (as water is forced through the leak back into the oil system). Also monitoring the pressure of the coolant when the engine is started from cold will also reveal a leak. The coolant is at normal atmospheric pressure when cold and only when the engine gets hot does the pressure within the coolant system rise (somewhere between 7 - 10psi depending on power unit). However if there is a leak the pressure of the coolant will rise rapidly as the oil system reaches pressure quickly, in other words the coolant system will be forced to the same pressure as the oil system through the leak. The remedy is to renew the head gasket.

Apr 16, 2010 | 1990 Peugeot 405

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