So, all the while I just could have just used the oil that I've been using in my A6 TDI & my son's MB Sprinter and on top of that it would have been better than what I was using. LOL (or not). They were giving us the MB .52 spec. Liters for $6., Also, when you go on the M1 site it recommends the ESP 0W-30 for my TDI, not 5-30, not sure why.
I still don't fully understand why the M1 site, when you input my '17 & '18 3.0 Audi models, that it comes up with the "lesser" non ESP 0-40 and 5-40 weights. If the ESP (0 or 5W) is the better specked product, why would they not promote it?