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    truckin's Avatar
    truckin Posts: 1, Reputation: 1
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    #1

    Sep 21, 2010, 05:42 PM
    My 2006 6.0L only gets 15.8 mpg, it has an AFE stage 2 intake, 4' turbo back exhaust
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Sep 21, 2010, 05:53 PM

    Use SAE 5W-40 full synthetic heavy duty diesel oil in the engine, Mobil 1 Synthetic Multi-Vehicle ATF in the transmission and power steering system, and Mobil 1 synthetic SAE 75W-140 gear oil in the differential. Together, these changes should increase fuel mileage 8 to 10%, save your turbo from sudden death, and allow your truck to last a long time.

    Additional thoughts on using a bypass oil filtration system:

    https://www.askmehelpdesk.com/cars-t...ml#post1415281
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