Originally Posted By: HTSS_TR
If you want to use oils approved for your Audi, M1 and Castrol 0W40 are on approved list, Amsoil of any grade is not on official Audi approved list.
If you like Amsoil enough you may want to try SS 0w-40, Amsoil says it is recommended but not approved.
Although you're technically correct, the Amsoil AFL 5W40 mid-SAPS Euro oil is fully approved (manufacturer approval) for use in Porsche A40 applications. For some reason, Amsoil has either not submitted for VW 502/505 certification or it has not been granted yet. However, since Porsche A40 spec is based upon the 502 spec, I wouldn't hesitate to use it especially if warranty is not a concern any longer.
Back to the OP, if warranty is indeed not a concern to you then you may try Shell Rotella 5W40. There was a thread recently in the Euro section discussing about how it reduced consumption in a VW.