Question about 2001 Nissan Altima

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What causes the oil light to come on though there is enough oil in the engine?

I tried to flush the engine with sludge removal once but it still reappear. What should I do next? it is only the oil light that comes on.Why.

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Hi Joseph, Some vehicles hav two lights for oil, one being oil level and the other being the pressure. The oil pressure light is the most common found on just about all internal combustion engines and I think common on the Nissan. If the oil pressure light is coming on it may be a defective sender switch, or low oil pressure. If when you start the engine when cold, a rattling sound can be heard, better take the vehicle to a workshop and let them advise you of the cost of repair. If the engine is quiet then you likely have a defective switch. Regards John

Posted on May 19, 2014

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Posted on Jan 02, 2017

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SOURCE: flush oil out of the radiator

u can flush it out with diseal while the car is running thats if u have flush point on your radiator if not run till running temp allow to cool and then drop bottem hose that will flush the oil out

Posted on May 20, 2009

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What causes my nissan altima 2001 oil light to come on though there is enough oil in the engine? Also, the car don't start from cranking and when it starts running, it jerks during driving as if it wi


Right stick a couple of cans of STP or wynns oil additive in the engine then flog it quick and never again use gunk in the inside of a engine

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it indicates worn hydraulic followers , worn main and big end bearings , worn oil pump
The sludge build up is from not changing the oil on a regular basis
every 10,000klms or 5,000miles
short runs and not allowing the engine to get hot enough to boil off the water vapor from the combustion process
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How to remove sludge build-up from 2000 dodge durango 4.7


Unable to comment on whether or not the diagnosis you have been given is correct or not, though it does sound reasonable, but in terms of getting rid of crankcase sludge, there are TWO issues/options:

1). Sludge inside the valve cover/s is usually a result of: a) sort distance journeys; b) Poor crakcase ventilation.

You may not be able to do much about a)., but the ventilation [b)] you can by making sure all of the tubes connection the crankcase to (usually) the air intake system are completely clear and able to vent the gases created in the crankcase.

Then to cleanse the lower end of the engine of any remaining sludge, which though unlikely, may have collected, the best option is to use a flushing oil. Engine flushing was in vogue back in the 1960's and 1970's when engine design led to a great deal more sludge. I understand that flushing oil is still available and you may wish to try it to see if it helps with the problem you are concerned about. Best method is to follow the manufaturer's instructions (on the can), but if in doubt, run the engine until it's thoroughly warm and then drain off the old oil. Once the sump is empty replace and tighten the drain plug and refill with the flushing oil and run for at least an hour (ideally more) using a range of revs, though never too high. Once done, drain the oil and wait until it's all out. Replace and tighten the drain plug and refill with the standard engine oil, and HOPE it's cured the problem you started with. Best of luck!!!

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At 28,066 dealer oil change. At 28,778 dealer flushed engine to remove sludge build up and changed oil. At 30,835 miles inspection, dealer flushed engine to clean out sludge and changed oil. At 34,630...


First dealer was NOT doing you any justice. Next oil change run a can of GUNK engine flush let idle 5-10 mins then change Oil & Filter and use a good oil like Castrol or Valvoline 10w-30. You won't have "supposed" sludge build up.

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Hello, I'm Donnie.
A couple of things come to mind that could cause the issues you're having.

It sounds like you may have some sludge blocking the flow port in the oil pan, there are 2 ways you can try to resolve this;
1. Parts stores carry an oil system flushing product that can flush out sludge and build-up, and has worked well for me in the past.
2. Do it the old fasion way, remove the oil pan and clean, or replace, the filter screen inside and make sure the oil port that allows the motor to get to the top of the engine is not obstructed, ( you can usually use something like a small hose, or wire to slide up in the port to remove any blockage/build-up.

If that doesn't solve your problem, my next best guess would be that your oil pump may be going out.

I hope this helps you.

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