Technical question on a new G30 xDrive. I opted for the xDrive on my new 520d as I live in the north of Scotland and snow/ rain are obviously a common occurrence. I previously ran an '06 325i SE which was rear wheel drive and I ran the car all year round with Vredistein Wintrac extreme winter tyres . They were a real good tyre wore exceptionally well and were good even in summer time dispersing rainwater after a summer deluge. The tyres on my 5 series are Michelin Primacy 3's, which are a highly acclaimed summer tyre, but I'm thinking of fitting a set of all season tyres as I think they will be a good compromise. When asking dealer about tyre options they said it was a matter for a tyre fitter to recommend tyres baised on a new star rating system. Does anyone have any knowledge on this subject or have a recommendation for a tyre? Also on the subject of tyres - the tyres I ran on my 325i were not run flats and they didn't bother it at all. Does anyone have any info on this matter as have heard a lot of BMW owners looking a going away from run flats due to cost. I have been advised that the electronic nature of the xDrive system makes it sensitive to tyre choice ? Thoughts anyone? cheers.