I am trying to figure out the proper fluids and the proper interval for the various aspects of the 4Motion system on my 2011 VW Tiguan. I cannot find the booklet that supposedly contains the maintenance schedule. My understanding is there are actually 4 different fluids involved: 1) the front bevel box which is presumably what would be called a transfer case on an Acura for example; 2) the 6 speed automatic transmission; 3) the rear Haldex clutch (which is immediately in front of the rear differential and requires a separate fluid); and 4) the rear differential itself. On a VW site, I have found a 2010 schedule that lists the automatic transmission fluid and the rear Haldex clutch fluid as needing replacement at 40,000 miles with no service interval ever specified for the front bevel box or the rear differential itself. There seems to be agreement on the proper lubricants for the rear Haldex clutch (a special VW fluid) and the transmission (VW Genuine automatic transmision Fluid). Does anyone know what the proper lubricants are for the front bevel box and the rear differential, and just as important, what the recommended intervals for those would be? If possible, I would like to switch those over to a synthetic. I'm also thinking the initial service interval should be sooner than 40,000 on the transmission and rear Haldex. All info will be much appreciated