From the "65+ Efficiency Mods" page:
Quote:
Originally Posted by MetroMPG
Synthetic transmission/differential oil
Reduces friction between gears leading to less energy being absorbed as heat into the oil. Also increases parts life. Again, most effective for vehicles in cold climates, since the viscosity of conventional lubricants increases as ambient temperature drops.
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There are a few threads that discuss synthetic or lower-weight
transmission oil. Has anyone experimented with thinner oil in the
differential of a RWD car?