i just had a overhaul on my 12.7 liter detroit 60 series. no egr. i seen my oil drop full to half on stick. should i worry? my shop said first 30k miles it will use oil.
oil consumption after overhaul
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 4noReason, Aug 10, 2020.
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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.
Last edited: Aug 12, 2020
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Rideandrepair Thanks this.
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You should change oil first time at 4-6k, though, to get any debris out left behind.
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