If you have not had trouble in the past, but this is a recent thing,
check the connections at the senders. My engine threw a belt, and I had
the same problem. Everything looked OK, but I discovered the belt had
knocked the connector loose from the sender.

John Rodgers
88 GL Driver

Alan Pickersgill wrote:

>I'm having trouble with the oil pressure light and buzzer coming on.
>I'm wondering if the collected wisdom of the list might know if this is because of over-sensitive oil pressure senders?
>Could it have anything to do with the type of oil filter being used? I remember debates about oil filters and pressure on vanagon engines. Does the wrong filter make pressure low or high?
>Any guidance would be appreciated.
>
>The background info -engine is a low mileage turbo diesel (140, 000 km) with new 20W50 oil and filter and a brand new pump. Rod and main bearings have been inspected by a couple of experienced mechanics. No apparent damage despite 3 episodes of the light coming on.
>Light and buzzer comes on only when engine is hot (normal operating temperature) and after working fairly hard 3,500 -3,750RPM for five minutes or more. Then comes on when the RPM drops - coasting to a stop at an off-ramp. On another occasion came on when the rpm fell below 2,000 after cruing at 3,500 or more. Then when RPM went back above 2,000 it went out.
>I've installed a Hastings electronic oil pressure gauge and it agrees quite closely with the mechanics gauge.
>I get 29psi at 2,000 rpm and it goe up from there.
>Below 2,000 rpm it falls quite low 5psi at 1,000 rpm and even lower at idle 800rpm.
>Pressure at cold is 75psi or more.
>I don't think this should make any difference but this engine is out of a 93 Jetta turbo diesel and is now in a 93 passat turbo diesel.
>
>
>Alan
>
>
>