Fuel Additives
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Joined: Aug 2008
Posts: 37,384
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From: Frederick, MD
In our 7.3 which has 280,000 miles we run a quart of general all purpose automatic transmission fluid to about 50 gals of fuel. It adds more lubrication to the fuel and gave us about 1 more MPG. I dont know if it would be alright to run it in the 6.4s with the dpf and there picky fuel system, i havent tried it yet.
I would not in a 6.4
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