So I went from ford 5-30 to rotella 5-40 and lost 3-5 mpg . I have about 4000 miles on the T6 same driving conditions . So the argument I have heard is that is better for the engine but at the cost of mpg . After doing some math its more expensive to use the 5-40 even at 50% cost of the 5-30 so I will be going back to ford 5-30 . Anyone out there have any thoughts
INFOTROLL
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