thanks mate. good to hear running a 90 hot has been fine. I went with the motul 300 full synth 75W90 that's recommended by wavetrac. I emailed them in the states and they said there's nothing in particular special about that oil and that the spec Vw oil which is 75 mongrade would have been fine. They just said they make that recommendation so that people think twice about what they put in ie no friction modifiers and don't use rubbish.