Well, I would first go to an auto part store and get the code(s) from the engine light whenever it is illuminated. Could be a sensor, could be oil pump, could be several other things. Engine code will point us in the right direction quickly.
It could just be the weight of oil you used as well though. As the oil warms it is "thinner", meaning that it flows more easily and is closer to the consistency of water. The bearings on your engine use a film of pressurized oil to maintain a gap between the crankshaft or camshaft and the block or rod. That gap is initially quite small and thinner oil is used. As the engine wears it becomes necessary to use a thicker grade of oil. With your vehicle having 150,000 miles on it, you may need to adjust the vescosity of the oil you are using. Same brand, just different weight/vescosity i.E. 10w50 instead of 5w30.
Post those codes and I will follow up. In the meantime, as long as there are no unusual noises coming from the engine then it is being lubricated well so no worries there.
Hope this helps.
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Thursday, January 8th, 2009 AT 12:30 AM