'89 Audi 200TQ:
It is possible, or likely, for the oil pressure warning light to illuminate and the warning chime to sound because of a change in engine oil weight?
I was running 10-W40 Quaker State which I just put in during an oil and filter change. Intermittently the warnings started going off and the oil pressure was lower than it had been previously. When the warnings would go off, it was almost always associated with revving in 2nd gear to shift to
3rd.I switched back to 10-W30 and all is fine. I could not get the car to do the same thing.
For my climate the manual suggests 15-W50 or 15-W40, but it seems my car doesn't like it. Or maybe I have a failing sensor or oil pump.
Thanks for your ideas on this,
Bill Graham
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1989 Audi 200TQ