1984 bonneville 58'000 original miles oil light


Asked by Jan 20, 2015 at 11:28 PM about the 1984 Pontiac Bonneville

Question type: Maintenance & Repair

I got a 1984 bonneville it has 58'000 original miles on it whenever I go past 40 mph the
oil light comes on but if I'm goin below 40 it don't come on it doesn't seem to be leaking
oil I check it all the time anyone have a idea on what might be the problem

1 Answer


Sounds like you have TOO MUCH oil in the crankcase. This will cause the oil to foam. When the oil foams the oil pump is actually sucking air so the oil pressure drops and the light comes on. Change the oil and filter. Then add the correct amount of oil and see what happens. Inspect the old oil once you've drained it. Does it have a strong gasoline smell? If so, replace the fuel pump. There's a rubber diaphragm in the fuel pump that can leak. When this happens gasoline leaks into the crankcase, thins out the oil, and will also cause the type of oil pressure problem that you're experiencing. Your fuel pump is mechanical and bolts to the side of the engine block. It is not in the gas tank or electrical! HTH. -Jim

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