90-PSI after Oil Change??

[moss6]

Changed the engine oil and filter (1,000 miles) this weekend and after startup saw the normal 0-PSI for a few seconds pressure went to 60-PSI, normal. I then did some other installs; Bed Rug and Pace Edwards bed cover; after which I went for a drive. The engine, on start up, didn't sound quite the norm for it, additional noises I haven't heard before, hard to explain just more busy sounding more whines and lower deep sounds, and the oil pressure was half way between 60 and 120 PSI as soon as I put it in gear and rolled out. I have not seen this out of this engine cold. First thought was that the factory oil was different from the Delvac 15W-40 I replaced it with, but couldn't believe the pump was making 90-PSI (a guess with the GM guage) LBZ never made over 60 cold. I assumed it would drop pretty quick as it warmed up but that was not the case, held steady half way between 60-120 even after coolant temp reached 210, so now I'm wondering if the new oil filter (bought from the dealer) is restricted. At that point I stopped to make a purchase (pecan picker-upper to rid the yard of the damned things) and after restarting pressure at 60, in gear and roll out back to 90, on the road I decide what the hell, nail it, which I did and after about 7 seconds hard acceleration the pressure suddenly dropped back to 60; what the f*#k, did it blow some restriction out!
Any ideas on this, and also this is not BS.

[Mark Rinker]

Hard to tell - factory gauges are notoriously inaccurate as to actual PSI reading - but if its varying that much from what you normally see - how expensive is it to satisfy your hunch by spinning on another filter?

I'd probably let it cool off tonight, run it tomorrow, and if its still making crazy pressure, replace the filter and see what happens next.

At least you have oil pressure! LOL

[moss6]

Hard to tell - factory gauges are notoriously inaccurate as to actual PSI reading - but if its varying that much from what you normally see - how expensive is it to satisfy your hunch by spinning on another filter?

I'd probably let it cool off tonight, run it tomorrow, and if its still making crazy pressure, replace the filter and see what happens next.

At least you have oil pressure! LOL

Mark, my concern would be that even if I put another filter on it then I still wouldn't know if something came out of the filter, went down stream and plugged up something. I don't think that there is anyway to check that out other than a complete tear down. I'm really having a hard time with deciding what to do, if something is blocked then I would think something is going to self destruct in pretty short order and likely lead to a less than desirable engine even if repaired. Another thought, not too appealing, is that GM might deny warrenty because I changed the oil and filter. This is really making me sick.

[Mark Rinker]

Relax. Most likely a problem with sender or gauge calibration.

If you are under warranty, and bought the filter from the dealership, how bad can it get?

Whats happening today...?

[moss6]

Wife said it's 60-80; had her go by the dealership and they said normal so I guess it's on them. Fingers crossed. Find it hard to believe that before the change when hot it wouldn't even get to 60 and the old LBZ ran around 30-40.

[Kennedy]

What did you use for a filter? I haven't seen if the application has changed for 2011?