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I'm hoping for some help from the experienced guys who have changed the oil in their gearbox, Transfer boxes and Differentials. I've read the info available on the FAC Thread regarding the various types of oil to use for a gearbox oil change but wanted to see which oils people prefer to use and also how much oil do you need for the following:

Transfer boxes
Differentials
Gearbox?

I believe that the Transfer Boxes and Differentials use SAE 75-W-90 (synthetic) and the Gearbox uses Audi/VW Oil No: G052162 A1 / A2 / A6 or ZF No: S671090170.

Regarding Gearbox service kits do you stick with OEM or is there any good aftermarket kits available? Likewise do you need any service items if your changing the oil in the Transfer boxes and Differentials?

Lastly is there any pitfalls to look out for when doing these jobs or any good advise from any of you would be greatly appreciated, thanks.

For gearbox I've stuck with OEM filters, bolts and seals etc.. with Pentosin ATF fluid. Diff oil I've used Audi stuff (something like a litre is enough but I'm sure someone will be along with the exact measurements. I've not actually change my rear diff oil yet. Might do it in the summer.

One things for sure, gear oil always stinks! make sure you don't spill any on your overalls (or the driveway). Its a smell that lingers. For gearbox oil, just be careful, follow the instructions and try really hard to keep everything as clean as possible.