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Oil is leaking into the cooling system of the car

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You could have a blown head gasket, cracked head, or a cracked block. Usually it is the head gasket unless you overheated the car to the point that it shut off.

Posted on Aug 31, 2010

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Posted on Jan 02, 2017

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OIL IN COOLANT RESERVOIR 00 CADILLAC DEVILLE


Are you sure its oil? If you bought it used someone probably added Bars Leak or some other cooling system sealer which can appear as oil. Cadillac Northstar engines are well known for cooling system problems, and that is usually the first step people take. If it is oil that could indicate an intake manifold leak or a head gasket leak, although it usually results in coolant in the oil, not the other way around.

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Oil and water mixing 2004 m benz c200engine oil in


unlikely to be engine oil, more likely transmission oil from faulty transmission oil cooler in radiator tank
take it in for a proper diagnosis and quote
the coolant system will have to be properly and completely flushed

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How do I check for a blown head gasket on my 1990


Pretty much same answer as I gave for 87 Reliant see below. Shops have equipment to do cylinder leakage test. Do basic stuff below before doing last test ...cylinder leakage...which costs $$$.

Main point you are losing antifreeze/water. Check to see if you have water on the dipstick mixed in with oil. If so...probably a head gasket. If oil looks normal..... Before you do any test, tighten every hose connection. Check for loose connection into antifreeze reservoir. Sometimes there are small cracks on top which lets out pressure from cooling system. Look for leaks on water pump and radiator. Look at spot where you park the car...any liquid on floor? Not sure?..Put piece of cardboard under car to see if liquid is dripping from car. No leaks?...Start with a pressure test of the system. The pressure test is simply equipment that replace the radiator cap, a hand pump connected to it then air is pumped into cooling system. You watch the gauge to see if pressure is dropping. If pressure does not drop ..problem is most like a worn radiator pressure cap or stuck thermostat.. Do not buy the kind with button on cap to push down and release pressure. get original type and correct pressure. If overheating still, thermostat could be stuck, replace. Overheating of engine causes vapor lock, bubbles in fuel, which causes car to stall and kill. When cools off, fuel cools down and fuel will flow through fuel system again. Large amount of oil disappearing with overheating also sounds like head gasket or cracked head....Tighten up all bolts to gaskets, look for oil leaks on garage floor or driveway. If engine has developed a miss when running, pull plugs out and look for wet fouled plug. If antifreeze leaking into cylinder...plug tip will be whitish, if oil leaking into cylinder, grimey oil fouled. Do compression test on cylinder that is fouled and that will pinpoint if bad head gasket or cracked head. When doing compression test, radiator cap is removed and you listen to hear bubbles in radiator from the cylinder leaking into cooling system. 87 Reliant not worth pulling engine apart if head gasket or cracked head. Best oil treatment to reduce oil consumption is "Engine Restore" Used on my 58 Impala 348 tri power for 28 years. If I did not add it after oil changes it used oil and smoked....I swear by it for ANY engine after 100,000 miles.

Oct 19, 2014 | Cars & Trucks

1 Answer

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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1999 dodge durango transmission has water inside


If transmission oil cooler is leaking, engine coolant may enter cooler, or transmission oil may enter engine cooling system. Both engine cooling system and transmission oil circuit should be drained, flushed, and inspected.

Sep 29, 2013 | 1999 Dodge Durango

1 Answer

Oil in the cooling system


oil in the cooling system comes from a transmission oil cooler in the radiator leaking. I take it that you have an automatic transmission Normally if you have a gasket problem the water would be in the sump oil. You will need to replace the radiator to effectively fix the problem and as a side suggestion consider an air cooled transmission oil cooler for the transmission oil as it helps the car to run cooler and keeps the transmission oil cooler and extends the life of the transmission.

Sep 11, 2013 | Cars & Trucks

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

My pt cruiser 06 2.8 turbo started leaking oil?


OK, anytime oil gets into the cooling system or vice versa, there's a strong possibility that there is a leak at the head gasket.

Could have to do with overspeeding the engine.

The cooling system can get up to 14 to 16 psi, enough to burst into the oil lines which run next to the cooling lines in the head and block.

If it's spilling on the front driver's side of the car, then you have some serious problems with this engine.

Jul 31, 2010 | 2006 Chrysler PT Cruiser

1 Answer

My car has oil in the anti-greeze / radiator. There is NO water/anti-freeze in the oil. What problems will this create?


I presume that you mean oil in the cooling system. there is a leak somewhere and needs to be attended to right away.

Oil in cooling system will deteriorate the hoses...

Oil pressure is often more than cooling system pressure, which is why coolant not in the oil.

Guessing that there is a head gasket leak.....

May 24, 2010 | 1993 Ford Mustang

1 Answer

Oil passing into cooling system


I would assume the truck is an automatic. If the oil is red in color or pink in the radiator then you may hae an oil cooler leak. The auto tranny cools the oil by passing the oil through the radiator in tubes. If these tubes are leaking you would experience the oil leaking in to the radiator. The other worse scenario would be that you have a cracked cylinder wall that is leaking motor oil in to the crankcase. Good luck

Mar 15, 2009 | 1994 Ford F350 Crew Cab

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