oil pressure

[jodmari]

im pretty sure at highway speeds I had like 60lbs of oil pressure now I have 40 when should I start to worry

[SMWS6TA]

It depends on rpm mostly.


on stock pump? Should be around 30-40 @ idle & IIRC 10 psi for every 1000 rpm above 2000rpm.


FBJ or Cutlas will know for sure.

[jodmari]

stock pump it starts out at 60 till the car comes up to normal temp then doesn't go over 45lbs even on the highway doing 70mph. i gess its getting tired has 150,000 miles on it. I just used to see it at 60lbs more often.. its time for a oil change anyway any suggestions

[SMWS6TA]

Try to cut open the filter and drain it in a clean pan. See if any hints of metal (maybe run a magnet through it) or bearing material.

Oil weight could also effect pressure readings but not too much between 5W-30 to 10W-30. Now 20W-50 or some race oils then yeah, but I doubt you are running those.


If you do decide to go ahead and change the oil pump, either LS6 or Melling 10295 are great options. I wouldn't bother with the Melling 10296 unless you're going to do a cam upgrade as well. Stock or mild bolt on's wouldn't benefit from the high output/high volume.



150k miles isn't too bad, your car is 15 yrs old. Plenty of LS motors getting above 200k. Only reason I killed my LS1 was because I was abusing it and it caught me. (Over Rev'd on a burn out, hit the rev limiter twice).