6,0 oil pressure

[Stick Racing]

Not exactly a racing question but a mechanical one.
I have a 06 Chev 2500 with a 6.0 engine, I've noticed a lifter noise upon start up in the morning. I checked the oil level. Full. The next day, the noise was still there. I noticed it only had 25# of oil pressure. After you drive it a few miles it climbs up to 50-55# and the noise goes away. Then I put another oil filter on it. No change. It seems to have low oil pressure at start up and the increases to normal pressure after a few miles. note, I use 15-40w oil in that truck and change the oil every 5k miles since new.

I had this conversation with my neighbor, who is an accomplished circle track engine builder, who was smiling as i was explaining this story to him. It seems we have a mutual friend with the same truck. same engine, same mileage and same problem. He is pulling the engine as we speak. Anyone else have this problem?


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Andy Stone 1102 A/S 1112 SS/C