I need info on VW 502 00, 505 00, 503 01

[kickster]

some oils state that they meet VW 502 00, 505 00, 503 01 standards. what exactly are these VW specific standards? Where can I get more info on them? I own several VW of different age. I want to know if they all fall under same standard or not!

Thanks in advance

 

[Quattro Pete]

Here's some of it:
http://members.lycos.co.uk/escape2music/oil/Crankcase-various-oil-specifications.pdf

VW norms start on page 54.