[Whiskers]

Ok, this is driving me :banghead:
1992 Cadillac Deville, 4.9. At first, I thought it was just the oil pressure light coming on at slowing/stopping, but a mechanical oil pressure guage has shown, that yes, indeed the oil pressure is low.
Replaced the oil pump and pressure sender.
Replaced con rod and main bearings. Checked the distributor as per suggested on these boards. Still no luck.
Where else should we be looking? What other things should we try?
Any other info needed to help you diagnose will be willingly given, as I am at my wit's end with this thing! :annoyed: All other things considered, I love my car and want it back on the road!

 

[Ranger]

Exactly how low is the oil pressure? Our former guru once said that at idle 5 psi is fine. I beleive he also recommended using a little heavier oil like Rotella 15W40.

 

[Whiskers]

It's low, but our guage isn't that accurate under 10 psi. My hubby said he read on here that we need an OEM one to get a good reading. We will also try the Rotella 15W40.
I'm hoping for the best!

 

[NickySantoro]

It's low, but our guage isn't that accurate under 10 psi. My hubby said he read on here that we need an OEM one to get a good reading. We will also try the Rotella 15W40.
I'm hoping for the best!

The Mr. is correct. Many of the aftermarket one size fits all senders don't get it done. Caddies seem to require the OEM unit. As Ranger mentioned, this was detailed by a former poster. I don't recall the tech reasons. Get a real deal OEM AC Delco sender then post back.
Try here..
www.gmotors.com
www.gmpartsdirect.com
www.rockauto.com
FWIW
YMMV
NS

 

[Whiskers]

:xsmile:
Thank you to those that replied.
We installed an OEM sending unit (which was cheaper than the one from NAPA!) and filled with 15W40. The problem is now gone! :woohoo: