Question about 1998 Pontiac Grand Am

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Just bought car with 111,000 miles on 3.1 v-6 ,motor has sludge in valve cover and am afraid of low oil press . What is the best way to rectify this ? I have heard of the run trans fluid in engine trick but scared of locking up oil pump or worse engine . Runs good and no other probs just worried about low oil press .

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DO NOT run transmission fluid in the oil. You can buy engine cleaner that you put in before you change the oil and let it run at idle for a 15 to 20 minutes, then change the oil and filter. It might take a couple of treatments to clean it all out.

Posted on Apr 20, 2009

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I have heavy engine sludge on my 09 g37. I was told changing the oil could blow a valve. 65000 miles on it. How can I fix? What's the best course of action?


drain the oil and use a engine flush oil , follow the instructions to the letter ,may have to repeat after next oil change, do them every 3000 miles including the filter, nothing beats good maintainance 15k what was you thinking !

Oct 20, 2014 | 2009 Infiniti G37

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Hi just bought i999 1.6 audi a3 and it has started to pulse when idling and oil light comes on when engine reaches nornal temp what could this be please help


If by pulsing you mean that the idle is fluctuating up and down, this is caused by oil/sludge build up in the throttle valve. To rectify this remove the intake pipe at the throttle valve. Use engine cleaner/degreaser on a rag to clean out throttle valve around throttle butterfly. Open butterfly manually to assist access. The oil pressure light coming on is usually caused by the oil pump pick up becoming blocked by carbon and sludge in the oil sump. If you have a suitable oil pressure gauge, check the oil pressure at the oil switch. Oil pressure should be 3.5- 4 bar at 2000 rpm at operating temperature. If pressure ok, Pressure switch may be faulty. If pressure low you will have to remove oil sump and clean out or replace oil pump pick up. If not done, may result in major engine damage. Sludge and carbon build up caused by oil not being changed often enough. Best to use a synthetic oil.

Jun 13, 2010 | 2007 Audi A3

1 Answer

Engine knocking noise in 2000 saab 9-3 SE?


It's a common problem with these cars i am actually fixing mine as of now. That car is all about oil pressure and when it is low you'll start to get a tap and or what sounds like a knock due to the lifters not having enough pressure. Try taking your oil pan off and check your oil pick up line going from the oil pan to the turbo. A lot of times it gets a lot of sludge build up and makes the pressure little to none. If that looks clear check the slump inside the oil pan and see if that has sludge build up. Well hope this helped

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3 Answers

Oil staying up in the value cover, not returning to oil pan


remove valve cover and check drain ports on heads

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Oil Sludge around top cover volvo 850 non-turbo


most likly cuase is a valve cover gasket seeping its not a big deal as long as its only a seep

Jun 09, 2009 | 1997 Volvo 850

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Premature oil pump failure 04 A4 3.0 Quattro


Absolutely - the 1.8T engine is known for sludging issues. If they diagnosed oil sludge then your engine is covered no matter the mileage. The oil sludge builds up in the 1.8T no matter how well cared for it is, and the sludge can block the oil pickup screen on the oil pump (it's an extremely fine mesh), causing oil starvation and taking out the engine in the process.

Go to www.audiforums.com and do a search there for "oil sludge" and the information will come up. You can learn all about it there. But if your engine has the sludging, and you have receipts proving the oil was changed at the proper intervals, you will get a new engine free of charge - one of the members there is an Audi technician and I remember him posting that he'd changed out a 180k mile engine under warranty due to sludge.

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1 Answer

Engine smoke&sludge


Smoking & sludge ...OK, first, smoking on startup generally is the result of worn valve guides or valve stem seals. Excessive sludge in the engine can worsen this condition as sludge buildup can block oil from draining back to the pan, instead remaining inside the valve cover where it can run down the valve guides overnight.
If you just got the car and want to get rid of some sludge, change your oil every 2000 miles for a few months. Use a good quality oil and add a pint of marvel oil to it each time. On an engine with substantial sludge, I don't advise using any flush products. They work too fast and end up jamming residue into the oil screen, preventing proper oil flow to the pump. It took a long time for the sludge to form, don;t expect anything will remove it immediately short of a complete teardown & rebuild. If that's the only problem you have just follow what I said and you will be OK.
No coolant loss, overheat or anything? Did sludge suddenly appear or as I thought, it just built up over time?

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1997 Toyota Camry with second round of engine sludge


The best way to solve the sludge problem is to drive the car! If you drive a few miles then shut it off that advances sludge issues. Make sure you get it fully warmed up. Toyota sent me the notice on the sludge issue in 1998. I have 327,000 miles on my Camry now. When I drive it I get it fully warmed up, and most days I put on at least 20 miles. I change oil every 4-5000 miles. These are great cars.
I never changed any of the common parts that fail on most American cars before 100,00 miles. Such as O2 sensors, alternator, starter, cv joints, all original still.

Vince Salmela

Dec 27, 2008 | 1997 Toyota Camry

1 Answer

Oil pump


Sorry to say, but you might have some serious problems. I'll list 3 vague the possibilites, best-case scenario to worst.
1. You blew a gasket, oil pan, timing cover, valve cover. Any gasket that holds engine oil in. If this blew out, you would lose oil, the light would come on (low PSI) and the motor would sieze.

2. You have a serious clog somewhere in you oiling system which caused a PSI spike, blowing a line or gasket. The clog is a problem, which comes from sludge and deposits. Oil ports, holes and lines in the engine are fairly small and not difficult to clog if the oil and filter are neglected.

3. The worst thing that could have happened is you blew your motor. Overrevving, driving to hard without letting it warm up or again, neglecting the oiling system. You may have thrown a rod through the engine block, dropped a valve, spun a bearing or lost a main seal. The main seal is the least serious, but the labor is still extensive.

In your '94, If the engine stopped on it's own (you didn't shut it off), it probably siezed. In many cases this is not repairable. Start car shopping.

Jul 27, 2008 | 1994 Hyundai Sonata

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