Originally Posted By: Lindeman
Does anyone know what the VW 911 o1 standard is?
It's a mistake. You mean VW 501.01.
VW 504/507 may be used in engines calling for VW 505.01, but with a few exceptions: 3, 4, and 5 cylinder PD engines with or without DPF, that are not equipped for "Long Life Service," require still VW 505.01.