'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
I switched back to 10-W30 and all is fine. I could not get the car to do the
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,
1989 Audi 200TQ