Which oil lab JG or Blackstone?
Well this year as I was getting ready to do my annual oil change. ( I always do my oil sample and get the results back before draining my oil.) I was looking at a forum that was championing Blacksto...
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I use Blackstone for the Allison only. We are full time so oil changes are at milage not time. Cummins recommends 15k we do it at 10k. Allison is 100k or 1 YEAR the coach is nine years old and under 50k. The transmission fluid analysis is also a firewall for our extended warranty.
