LS1Aggie09

iTrader: (25)

I have noticed lately that my cars oil pressure has been dropping. It used to sit around 40 to 45 psi at idle and then get up to about 75 under load at high rpms. Now my pressure sits at about 25 to 30 at idle and when i accelerate in low rpms, the pressure actually DROPS about 5 psi until i let off the throttle at which point the pressure returns to about 30. SOMETIMES the pressure will sit at 35 to 40 like it should but then 5 minutes later it has dropped again.


What could be the issue? I am trying to do a little bit of research...but haven't found much yet. Could it be a lifter or worn components increasing clearances?

I have a 02 Z28 (which i thought had the LS6 pump from factory?) with near 130k miles on a stock longblock and T56. I have oil seapage at the rear main seal. Longest my car has been without oil change is 3200 miles and I always use Non-Synthetic Mobil Clean 5000 5w30.

Thanks! I hope it isn't much or I am paranoid but I know that I have high mileage too...

-Karl

outkast6991

iTrader: (34)

my car had a similiar issue. it went through 3 different o-rings and 2 pumps before i was told the car is just tired. on a tip from a friend i swapped in a new pressure sensor and found the old one was cracked at the base. new sensor=20psi of extra pressure. just a thought. good luck

LS1Aggie09

iTrader: (25)

do i have to tap where the pressure sensor is with the mechanical gage or is there another place on the block to check the pressure?

edzsilverss

iTrader: (4)

See my wow just wow thread from today in this section. Sounds just like the issue I was having. Good luck.

SOMbitch

iTrader: (8)

I hope the OPS is your issue but typically when it dops initially bearing clearances are opening up and then OP rises as rpm picks up as the pump spins faster.