oil consumption after overhaul

Have you been idling a lot? New engine needs to be ran hard to seat the rings, dont baby it and avoid idle

 

Takes a few miles to get the rings seated. If you are on the Interstate try to vary your RPM a bit. If it continues to lose oil I would have a compression check done.

 

It’ll burn oil, even push unburned oil, and slobber it out of exhaust connections, and blow it out of the stacks sometimes, at first. It’ll go away, as the rings wear into the cylinders and match up with the cylinder sleeves. Best to work the engine, even a little lugging is better that higher RPMs, because it causes heat, and puts more side force on the pistons. Could take up to 70k miles to fully break in. Watch fuel economy. Once the rings get seated good, It will increase, noticeably. Sometimes it’s like throwing a switch, As much as 1 mpg. New 12.7s were notorious for that, right at 70k, almost like clockwork. I’ve heard story of one that wouldn’t seal up, untill it overheated once, and after that it finally sealed up. The heat is the key, that’s why you need to work it hard.

 

That’s what they say, not too hot obviously. I recall a Guy once, with a old Cummins, running with a winter front, partially closed in summertime. When I asked why? He said he just did an OH, and was breaking it in. I’m not suggesting that, but from what I’ve read, more force is put on the sides of the cylinders at lower hard working RPMs. You can look it up yourself. It’s interesting.

 

You should change oil first time at 4-6k, though, to get any debris out left behind.

 

Hi there, did inframe 25,000 miles ago( 12.7 pre egr) and just noticed I'm burning maybe 1-1.5 gallons of oil between oil change. Also I did notice small oil stain on the ground when left overnight from the blow by tube( doesn't smoke more then usual). Oil pressure is great, 52 on cruise and 25 on low idle. I Don't idle the truck more then 15min. The oil plug magnet had some shavings as well picture attached

 

Don’t worry about the metal.

If you haven’t yet. Hook up to a heavy load and go work it. Remember high boost pressure to seal the rings for break in. Work it hard.



From what I know of this engine it was never known to not use some oil.

Oil pressure does not seem abnormal either.