Tons of oil out breather tube | Cummins Diesel Forum
The oil fill tube is conveniently 1 1/4". The breather I found at the local AutoZone was a push in style that had a grommet for a 1 1/4" hole. I shoved it in there, left the other breather tube open, and the problem seems to have gotten a lot better. I haven't really driven the truck enough to see if it's completely solved, but it is better.
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