Thread: 7.5 professional rebuild 15K miles no oil pressure at hot idle

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IMHO, I would not run the motor until I found the reason for the zero pressure at idle. The first thing I would do is examine the oil and cut the filter open, looking for particles. If nothing in the oil, it could be a broken or jammed bypass spring in the oil pump or clogged oil pump pickup tube screen.
BTW, I've heard the formula has changed for Rotella oil and may no longer have enough zinc additive to protect a flat tappet cam.

God I hope not. If that is the case I may have done in another cam.

Originally Posted by twolaneblacktop

God I hope not. If that is the case I may have done in another cam.

Don't jump to conclusions to fast, check the oil and oil filter for metal particles first. It may just need the pan removed and the pump repaired.

Originally Posted by 36 sedan

BTW, I've heard the formula has changed for Rotella oil and may no longer have enough zinc additive to protect a flat tappet cam.

I believe that's true. New regulations on diesel emissions led to a drop in ZDDP in Rotella's oils a year or three back. If I were running a flat tappet cam I'd spring for Brad Penn's oil. Some say that once you've got a good break in that any major oil is OK, but I'd say that's playing Russian Roulette with your engine - at what point is it going to fail?

I changed the oil first No issues with it or the filter. If it wiped the cam there would have to be valve noise? I just went to the Shell Rotella face book and ask the question. I'll report back when and IF they reply.

Originally Posted by twolaneblacktop

I changed the oil first No issues with it or the filter. If it wiped the cam there would have to be valve noise? I just went to the Shell Rotella face book and ask the question. I'll report back when and IF they reply.

Again, don't jump to conclusions. If it's the oil pump, pull the pan and fix it. BUT, drain the oil again first and cut the filter open to see if any particles are there...