Try the following link from Halfords: http://www.halfords.com/webapp/wcs/stores/servlet/categorydisplay_storeId_10001_catalogId_10151_categoryId_165581_langId_-1 I use them for reference and then use the result to continue my search. 10W/ 40 or 5W/ 40 Full or Part Synthetic We drive an '06 RS4 and that gets through a lot if oil for seemigly no reason. It is on an Audi service plan and they say the car is fine.