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    Can you change your Ford rearend fluid viscosity?

    I have a 2003F150 with a 8.8 rearend that Ford "fills for life" with a 75W140 gear oil. Those 8.8's in the past used a 75W90 gear oil & I was curious if you could switch to a Schaeffer's 267 or Amsoil series 2000. I've heard of guys doing this & improving their fuel mileage 1-2mpg. I think Ford...
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    Oil suggestion for 5.4 Ford engine

    Hello everyone I've been reading posts on this site for a couple of weeks now & you guys seem to really know your stuff so, I wanted to ask your opinions. I have a 2003 F-150 with a 5.4 engine. I'm running Ford 5w-20 till I get around 10000 miles on the truck. Right now I've narrowed my choices...
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