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For the front (1 litre) & rear (1.4 litre) diff's you will need 75w-90 synthetic Gear oil meeting GL-5 specs. For the transfer case (.85 litre) of ATF meeting Esso LT 71141 specs and for the tranny the Mobil 3309 will be just fine but you should also replace the pan filter and gasket. I used Redline D4 ATF as it meets both tranny and transfer case specs but if you use the Mobil 3309 don't use it for the transfer case as it is not a full synthetic and it only meets the Aisin/Toyota JWS 3309 spec. For the transfer case you could go to an Audi/VW dealer and get a bottle of the transfer case fluid for a Q7 or Touareg as they use the same transfer case but are probably cheaper than a Porsche dealers price, price it from all 3 dealers and go with which ever is less. The tranny has a special fill procedure. The procedure says: Engine off, after replacing the pan & gasket (make sure the O-ring is around the neck of the filter and lubricated before pushing it into the valve body and bolting it on), fill the pan with fluid till it is full, then start the engine and start filling again (fluid from the pan gets sucked up by the tranny oil pump), when the pan is full (engine still running and fluid temp obviously increasing) you plug the fill hole off (should be slowly dripping as the temp of the fluid is increasing and expanding) at 40'C fluid temp. With that said, how you measure the 40'C is going to be up to you. Many/most, that do a bit of work on their Cayenne's and/or have other (post '96) Porsches too use a software called Durametric that replicates many of Porsche's own PIWIS software. There are other aftermarket software tools out there but not as popular as Durametric. If you by chance have any VAG cars then the Rosstech Vagcom works great for this too. Some have even used a Infra red tool and just pointed it at the pan/fluid dripping then used this method. Others have also just filled and when the dripping fluid felt a bit warm then capped it off. I will say it is almost no problem being a little over full then being a little under full. Also, while it is warming up and you are still filling it you can put it in drive (obvioulsy parking brake on and foot on the brake, take no chances in it moving) for a few seconds, then reverse and repeat a couple of times (shop manual says to do this), helps the fluid heat and to get air out of the system.