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Is he towing with it all the time?

I ran into this same issue about a year ago with my LMM. It never used oil at all, but when I took a good trip to the mountains and put her to work, I started to use oil. I tossed the question out to the forum here and got some good response. Sounds like GM has a bullitin out that says it is normal to use 1 qt of oil to every 100 gallons of fuel consumed. I never had this issue till I started working it over the mountains. I ended up using 2 qts over the entire trip of 4,000 miles in two weeks, but pumped just over 300 gallons of fuel. And since then it only uses oil when I'm towing heavy.

Might something as easy as this. Here is my original thread from last year..

http://www.duramaxforum.com/forum/towing-hauling/434010-question-those-tow-steep-grades.html
 
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