RE: Gear oil
You would probably see little to no improvment on mileage unless you switched all your drivetrain to a synthetic oil. However, you would probably gain some longevity and run cooler temps on your drivetrain. Be carefull not to start using sythetic oils in an older engine as it has a tendency to leak around old seals. You can use it in a new engine and never have any problems with it for the life of the engine but old seals tend to shrink with it. Also, once you start using sythetics, you shouldn't switch back to a conventional oil.
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2004 Ranger FX4 Level II
2005 Focus ZX4 ST
2000 F350 CC DRW 4x4 PSD Lariat
1988 Lincoln Town Car Cartier
1985 Mustang GT
1997 F350 4x4 PSD (Sold)
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