Can someone please verify this website is correct?
http://www.oilspecifications.org/volkswagen.php
It's actually saying that 504 superseded 503.01, the old "high performance" oil spec. The way I understand it is that 504 oils can be used on anything that calls for 502, but not the other way around. 504 does not technically "supersede" 502 but rather "supplements" it. The Lubrizol graphing tool shows 504 being stricter than 502 (and also placing emphasis on fuel economy).
Lubrizol's site actually shows that 502 was revised in 2005, wheres 504 was revised in 2004. VAG is still selling cars that call for VW 502 oil, like the new S4.
http://www.oilspecifications.org/volkswagen.php
It's actually saying that 504 superseded 503.01, the old "high performance" oil spec. The way I understand it is that 504 oils can be used on anything that calls for 502, but not the other way around. 504 does not technically "supersede" 502 but rather "supplements" it. The Lubrizol graphing tool shows 504 being stricter than 502 (and also placing emphasis on fuel economy).
Lubrizol's site actually shows that 502 was revised in 2005, wheres 504 was revised in 2004. VAG is still selling cars that call for VW 502 oil, like the new S4.