Does'nt matter what oil you put in the gearbox it will not affect how the viscous works,they are a sealed unit that contains a silicon oil, do change the gearbox oil though as buy now it will have the texture of syrup and not doing a very good job of lubricating the Gears,bearings and shafts in the rest of it. you do not need to use anything flash (or friction modifiers) as you can make the gear changes worse by the fact the syncro's will not work properley (they need friction to work)
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