I used to use the Fully synthetic Fuch's Super Titan 10w-40 but my VR used to drink it. It was then suggested that I use Castrol Magnatec (which is also a 10w-40).
Personally I settled on Castrol GTX2 which was a 20w-50, although they have just renamed and re-released it so it's now called just "GTX" and is in a white bottle. Plenty of people have said this it too thick an oil, but the counter to that is that the VR6 runs damn hot and the specs were written for Germany... where is snows more and doesn't do 40C+ days so often... Meaning it's heats up and runs fine anyway.
I have been running this for years without issue and haven't noticed any adverse effects or anything unusual when doing oil changes (which I do every six months).
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