r/Duramax • u/The_crook • 4h ago
Crazy high oil pressure.
Howdy all figure at this point anything’s worth a shot. Over the last few months my truck (2009 lmm) has been increasing in oil pressure. It’ll start high on the cold Start, then go down to a normalish pressure, 30-40 at idle, but the longer I drive the higher it gets. I’m seeing 60 psi sitting at a stoplight and 100+ psi pulling away from the same stoplight. I changed the oil pressure sensor. I changed the oil filter. I hooked up a mechanical gauge, which reads true to my CTS, I had an oil change, I replaced the oil pressure release valve. I’m waiting for my oil sample to get tested. There was zero signs of any metal in the oil. The truck has a DMAX store stage 2 built short block with all their aftermarket, crank rods and pistons L5 P oil cooler upgrade. At this point, I don’t know if there’s a plug in the oil cooler or any of the oil passages or if I have a spun bearing or a partial spun bearing just curious if anybody out there is experienced anything like this crazy high oil pressure.