Question about 1997 Oldsmobile Eighty Eight

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Antifreeze in oil

I fixed the prob. in the upper intake but would like to know now that the antifreeze has gone through the motor will it hurt anything in the motor after changing oil and new antifreeze has been put in will it hurt the berrings, cam shaft , or anything else in there ? someone told me that it would freeze up on me down the road !! are thay right?

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Best thing run with some engine flush in the oil then change oil and filtr and reapeat again in 50 - 100 miles.everything shuold be ok

Posted on Mar 07, 2009

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Check gauges, the themo gauge indicates hot, open the hood and no steam of being overheated. liquid anit freeze gone.


Chevy has a problem with this . The check gauges light means its the oil or the anitfreeze . I don't know what year your vehicle is but the basic problem is the intake manifold is aluminum and the block is iron they expend and contract at differant rates so if the engine gets to hot the gasket that seals the two fails because there isn't enogh bolts holding the intake down to the block 8 total and all in the 4 corners of the block - maniflod . The problem is vary likely the intake manifold gasket check for oil in the antifreeze and antifreeze in the oil on the dip stick it will look like a white fomey residue on the stick and in the antifreeze if you take the radiator cap off you will see oil floating on the top . You can save the engine but the intake manifold gasket needs to be replaced . The olny other cause would be the engine oil being to low but in this case the engine is probably on the way out depending on what engine and what year

Apr 12, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

Losing antifreeze changed thermostat and resivoir cap


Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.

Feb 22, 2011 | 2002 Oldsmobile Intrigue

3 Answers

I have a 2005 pontiac gxp that has been using oil and antifreeze but I checked the antifreeze and there are no signs of oil and also the oil dipstick has no antifreeze on it either.....I used about 3...


If you have the V-8 Engine, just totally disregard this post.

If you have the 3.8L V-6 engine, your oil consumption problem is most likely to be caused by the PCV Valve if you cannot find any external leaks. These are also known for the upper intake plenum leaking antifreeze. The ports in the manifold that go to the throttle body are made of very thin plastic. The EGR tube, with its hot exhaust gasses, goes right between them. This causes the plastic to heat up and crack, causing an antifreeze leak that goes directly into the intake and gets burned in the combustion chambers.

DORMAN makes a replacement upper plenum kit to fix this problem. The kit includes the upper plenum with thicker coolant passage walls, an intake manifold gasket set, a smaller-diameter EGR orifice, and a new PCV Valve. This kit will probably fix BOTH of your problems.

The DORMAN part number for your car is 615-180 Shop around...prices vary considerably.

Feb 02, 2011 | 2005 Pontiac Bonneville

2 Answers

Hi my gmc envoy 05 i check the radaitor i see that have an oil.so what is the problem we have a leak?


There has been a problem with the Dex cool orange antifreeze deteriorating the upper and lower intake manifold gaskets, causing coolant to leak in to engine.If there is antifreeze in your oil, it will ruin your engine. If you find antifreeze in the oil it will cause the oil to become thick and frothy and will not lubricate the bearings and other moving parts, causing an engine failure. If there is evidence of coolant in the oil, do not drive the vehicle. Have it towed to a repair shop and have the gaskets replaced, oil and filter changed, cooling system flushed and refilled with GREEN antifreeze that is compatible with aluminum radiators and engine parts.

Dec 29, 2010 | 2000 GMC Envoy

1 Answer

My 2000 Park Avenue Ultra knocks when you first start it up, but goes away after it warms up. It is also leaking antifreeze. Do you know what may be wrong?


Late model GM cars are plagued with antifreeze leaks around the Upper Air Plenum gasket and also the Lower Intake Manifold gasket. This is brought on by Dex-cool antifreeze deteriorating the gasket materials. If the Lower Intake gasket is leaking, it may have contaminated your loil with antifreeze. If there is antifreeze in the oil it should show up on the dipstick as a gummy sludge. GM has issued Technical Service Bulletins to their dealerships concerning this issue. Check with your local dealership to see if they will repair it at no charge. There currently is no recall, so they probably won't. In that case, take it to a good garage and have it repaired. Don't wait too long. If the oil is contaminated, it will damage your engine from lack of lubrication.

Dec 21, 2010 | 2000 Buick Park Avenue

2 Answers

What could be causing oil to leak into my antifreeze?


You either have a cracked cylinder head or a leaking cylinder head gasket.

Dec 15, 2010 | 1995 Chevrolet Lumina

1 Answer

Can a bad intake plenum leak antifreeze into the engine on a 2002 century 3.1?The computer code was misfire #1 cylinder. Complete tune-up done, same problem, new#1 injector, same problem. Now the coolant...


I see a lot of lower intake gasket leaks on these but usually you get an external leak or you'll find coolant mixed with the oil, not a misfire. Upper plenum is dry on the 3.1 and just bolts onto the top of the lower intake. We usually apply pressure to the cooling system overnight with the spark plug removed from the misfiring cylinder. If there is coolant in the cylinder come morning then you only have to figure out where it is coming from. If the plenum is removed during the test you might be able to see where the coolant is or isn't coming from with a borescope by looking down the intake runner.

Jun 01, 2010 | 2002 Buick Century

3 Answers

1999 tahoe has water mixed with engine oil.RBM starts to decrease. what should i do ?why water mix with oil? in the future ,what are the consequences?


Get that fixed ASAP, Water in the oil will destroy the bearings. The intake manifold gaskets may be bad, leaking water into the engine. Have a repair shop check it out and recommend repairs. Do not put this off, unless you want a new car.

Nov 04, 2009 | 1999 Chevrolet Tahoe

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