506.01 is 0w-30 SLX LongLife2 and you can buy it from the dealer. To me it doesn't matter how much it cost because if you don't use correct oil your engine valve train will eventualy fail, maybe it will be at 80,000km or sooner and than the difference betveen right and wrong oil will be payed many times over. There is a lot of writing at tdi.com forum about it. To me it is not worth the risk.