It is normal for the oil pressure to drop some when warmed up.
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My Titan does the same thing about 10 psi. That means it is definetly time to do an oil and filter change.
Its due to the heat in the subsurface that is caused by the pressure at depth.
The oil thins when hot and the oil pump is driven off the engine so, the lower the engine rpm's, the slower the pump turns.
The oil pressure will depend on the condition of the engine. If you have 10 lbs at idle when engine is hot with this mileage, you are within specs. I would use 10W-30 oil. oil pressure of 10lbs and up is acceptable at hot idle. i like to use havoline 30wt oil. have never had a problem with it.
Using 5W-30 oil in summer, my Catera's low oil pressure warning and light will come on when the engine is hot. But with 10W-40 oil this condition will not occur. Oil pressure gauge may indicate low pressure, but not enough to trigger the warning or the light.
You need to have the oil pressure checked. It could be a worn engine or thin oil causing that.
the engine gets hot and while your engine is running your oil is going through your engine lubbing it. by the time the engine gets hot the oil is spread throughout the engine. if you have too much oil in the gauge will act weird because its hooked up to your oil to read its pressure. if it was youroil pump or switch it would do this when the engine was cold to. make sure the oil is at the correct level b4 spending money on a switch or pummp
you need do take the oil pressure switch off . install a manual oil pressure gage . then check oil pressure , cold and hot , cold will be higher / 30-40psi . hot at idle shouldbe around 8-12 psi or so. , if that checks out ok , you might just need a new oil pressure switch(it shoul be beside the oil filter . on the housing . if lower , your oil pump oe engine is worn out. time for a rebuild . hope this helps.
The light is on because the engine had Low oil pressure. Caused by low oil level, or defective oil pump. Check the oil level and if it is full seek professional help. Do not drive this car with low oil pressure or you will destroy the engine. If it has gotten hot then you have already done some damage.
Oil pressure is low or thereis a defective oil pressure switch. You need to pot a pressure gauge on it when it is hot.