Cm871 oil consumption

[Bigstank]

(02-10-2020 )Jose9640 Wrote:  I have a 871 with a million miles on it. It just recently started using up a ton of oil. Blow by seems good. No leaks. Crankcase filter it bypassed. I’m using 1 gallon every 2500 miles. First thought was carbon packing but this truck has been deleted for about 200k miles and never used up any oil until now. What should I look for?

I had the same problem. Turned out to be a broken ring on cylinder #6. So I had haggai rebuild it