3+ yrs ago purchased a 07 Yukon Denali w/6.2L. At the time it was leaking and burning 2 qts/1000 miles. I installed a catch can, replaced the rear main seal, and did this TSB: https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
Doesn't need any make-up oil between changes anymore.
Doesn't need any make-up oil between changes anymore.