I called into the local dealer today to pick up some oil to top up my car. Ive a ibiza fr tdi. Told the guy my car details and he gave me a litre of castrol SLX Longlife 2 506/01. (0W-30) I asked him if this is the correct oil cos i thought this is for the variable servicing, but he said no, the fr uses the 506/01. Just wondering if this is fine to put into my fr before i use it?