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Have you considerdthere is nouthing wrong and it just might need a service!
on those there is a carbon senser in the sump,when the oil gets burnt (BLACK) it is full off carbom AND CARBON CONDUCTS ELECTRICITY! OIL DOUSE NOT! THAT IS HOW IT KNOWS TO PUT THE SERVICE LIGHT ON! UNDERSTAND? So service it and change the oil it needs it! then light will go away!
The Nissan motor that came as a V6 will rattle on start up if it has the wrong oil filter on it or the wrong oil or oil that needs changed badly 10-40 resists rattle better than 5-30 and works good in motors that have some miles on them. Does the oil light go out right away when the motor starts? Change the oil first with the right oil filter before you try anything else.
Most of the time they are located in the front part of the engine by where your timing chain would be or towards the top of the engine in the front part.
I've had the same problem on other GM V6 motors. You need to have the rear main seal replaced to fix the leak. GM was notorius for oil leaks in those motors since the mid-80's and never did anything to fix the problem.
Two very likely sources for engine oil. You could have a valve cover leaking or a rear main seal. The best way to check is to trace the source of the oil. This requires a very thorough steam cleaning to remove all the old oil. Place an oil dye pack in the oil (about 3.50 at Napa and other parts stores). Run the engine for about 15 minutes and use a blacklight source and a mirror to check the back of the engine below the valve covers and closest to the firewall. Check out how the fresh oil floureces in the blacklight source by checking your dipstick for the color of the glow. If the back of the engine is dry and clean and your puddle is still glowing from between the engine and the transmission, you have a rear main seal and the transmission will need to be removed to change the seal. Spend the time on the diagnosis before you spend the money.
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