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Q: My oil light flickers on my 2000 Nissan Altima on 2000 Nissan Altima

When I first start my car, the oil light flickers on and off. It dies this for about 30 seconds and then it stops. It does not come on while driving. It started about 3 weeks ago when I had to change my distributor. I was also leaking oil out of my valve cover gasket. The plug inlets were full of oil. I changed the spark plugs but not the wires. The mechanic said they looked good still. Changed valve cover gasket but still leaked in one inlet. Used packing sealant and it fixed the leak. I also changed the oil pressure switch also. Could there still be oil in the plug inlet? Also didnt change the wires and Im using NGK V power plugs instead of Platinum plugs. Also I constantly check the oil and oil level is fine and looks clear not dark. Could any of these things cause the oil light to flicker or would it be something more serious?
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Last oil change? What type oil was used? How many miles on car? Can have the pressure checked with a test gauge to see of a pump or pressure problem exist.
Last oil change was less than 3,000 miles ago. Ive always changed the oil around the time its due. Last oil used was a higher grade. Either 5w40 or what ever the higher mileage oil would be. Im actually at a mechanic now as we speak and my car is on the lift. He said its either a defective oil pressure switch or something in the oil pan or filter like sludge so theyre taking it off to see and when they do the oil change Im having them put in a bottle of lucas oil treatment for added measure. Ill keep everyone up to date just in case this happens to someone else. Thanx for everyones responses. :-)
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