also, amsoil is vw cert for 502.00, 505.00, 505.01.
Amsoil is not certified by VW. It probably would pass all of the tests, but Amsoil won't pay VW for the certification process.
I've attached the most recent approved oil list from VWoA if anyone's interested
Well, they are not 505.01 certified.
FTR the testing process costs around $2,000,000 total when it is all said and done. That is the biggest reason Amsoil will not pay for it. It is easy for Exxon/Mobil, ELF, etc to pay this money, they are huge companies, amsoil is not. Amsoil does warranty their oil. If it causes a problem, they will cover the repair, of course there are stipulations, you must have the oil tested, etc....
In my PD TDI (requires 505.01) I have ran, Motul, Elf, Castrol and Amsoil. Amsoil tested better than all of them. i will see if I can find my UOA's for each.