HI, i have been using 506.01 spec oil in my diesel tdi Volkswagen polo for a year and a half now.
I opted for the long life service interval available here in the U.K. I was told that U.K. Volkswagens could come with a factory fill from either Castrol, Fuchs or Shell but all fulfilling the VW 506.01 spec.
I have just over 18,500 miles done at present and have used just under a liter and a half of oil in this time, not bad as my previous V W diesel used a lot more,
I suppose a lot of forum members will think i am crazy to trust OC Intervals to an on board computer but i am quite happy as i only use top quality and sourced diesel plus Millers dieselclean additive which raises cetane levels and lubes and cleans pumps and injectors.
It will be interesting to see how far i can get on oci,s as the car does minimal short runs and averages about 45 miles per day at 60 mpg, will keep you posted how far i get. Incidentally my local dealer had difficulty getting castrol 506.01 and is now using Fuchs long life instead.
regards Gus geddes.