Thinner diff oil: more off power steering, less on power, better on bumps but if too light can make the car grabby.
Thicker is the opposite. Not really sure about spares seeing as I don't own one.
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Durango, Novarossi, Losi, Sanwa, Savox, AKA, Optifuel, Tamiya, Kyosho and lots of mods
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