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Search results

  1. S

    Dealer wouldn't update my 2015 TCM today or do the Rotella switch

    This is what I believe. I have a 2014 and change oil myself at 5000-6000 miles. When I first heard of the oil spec change, I went to the dealership and verified it. I had been using Quaker Ultimate Durability with 1qt Lucas. Now I'm using Rotella with 1Qt Lucas. Fuel mileage has gone down...
  2. S

    Dealer wouldn't update my 2015 TCM today or do the Rotella switch

    Sounds like your truck is in permanent tow mode. That is how mine shifts when I press the button.
  3. S

    MPG lower while using cruise control

    I've noticed large variations in my mileage for no apparent reason. The answer lies somewhere among outdoor temperature, humidity and regeneration cycles. Best mileage I ever got was 32 avg on I 40 in the mountains around Asheville (only once). Mountains at 70 best?? Sometimes it drops to as...
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