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I use Amsoil 10-30, Did a 1,500 mile test before and after. No improvement in MPG. Wish it had helped but it didn't.
I do use their bypass filter system and routinely go 50,000 miles between oil changes. Oil analysis says I'm discarding good oil but I lose my nerve after two years' service.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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