yet another low oil pressure thread

[jVanderWood]

Thanks to all for the replies to my last post... won't have time to work on the instrument clusteruntil the weekend. Moving along to issue #2 - of many - I don't want to wear you out so maybe I'll post one a week.

92 cabriolet - 140K miles. Has great oil pressure (5 bars) when cold, but dips to .5 bars on warm idle, and up to about 2 bars when warm and revving. I just had a decent mechanic replace the oil pump and put 20/50 oil in. No difference.

Numerous other posts indicate it could be a sensor BUT my question is: Since there are (I think) three total sensors - 2 for the light and 1 for the guage - and they all apparently agree with each other that the pressure is getting a lot lower as it warms up - it would be unlikely that it's a sensor, right? I really don't want to drop $150 on a new guage sensor just to see if mine is bad.

Thoughts? Bad bearings? She runs great...

Thanks,
John

[Fourt1thirty]

All the sensors get ground from the same place. Bad block ground? Bad alternator ground?

I had the same problem with my girlfriends car until it just decided to go away one day. I had tested the guage ground and found nothing, and had tried grounding the guage sensor with nothing yet again. My guess is a bad connection somewhere.

I have to ask though, what kind of filter are you running?

[jVanderWood]

Aaron, regarding the oil filter... can hardly see it but it's white with red letters that look like they might say "POW FLO".

[Fourt1thirty]

I'd remove it and pick up a filter from a european car specific shop, or dealership. The only filters I use are Bosch, Mann, or OEM VW. Any of the 3 will be black with white letters.

I've solved the symptoms you seem to be having more than once by replacing the shitty oil filter most shops and lube places use with a quality one.