I am driving a 1995 Bonneville and, lately, whenever I am idle, at a stoplight for example, my oil pressure drops and my check engine light comes on. Any ideas on why this could be happening?
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Sounds like your oil pressure is dropping at low RPM, which could be one of the following: low oil level, a bad oil pump, low viscosity oil, or worn bearings.
First step after checking the oil level is to check the oil pressure with a manual gauge.