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As the oil heats up it becomes thinner. If the engine bearings are worn the pressurized oil leaks past the bearings far easier and the oil pump will be unable to pump sufficient quantity to keep the pressure up. Next time you change the oil use a slightly heavier grade oil. If you've been using 5W15, change to 10W30. Whatever the numbers are now, change to the next level up.

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Q: What would cause the low pressure oil light to come on when the car has been on to long in a 95 Cadillac?
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