He's probably talking about sulfer content in fuels which used to be an issue when American fuels were higher in sulfer. I believe the difference is much smaller if at all now. Personally I don't think Lubri-Moly is anything special and if I had to choose I'd use Mobil 1 or Castrol in a Euro vehicle.
Regarding the Total Quartz ....that thread was locked before I got to ask about the 2 jugs of 0w20 Ineo Extra that I picked up yesterday for $13.XX each when I went in to buy a spark plug for my lawn mower. They were sitting on the 'Clearance' rack and I couldn't resist. It says it's "recommended by Aston Martin for it's V12 Twin Turbo" so I'm sure it will work fine in my daughters Mazda 2.5 NA.
Does anybody think this oil is any 'stouter' than Mobil1 AFE 0w20, PP 0w20, Castrol Edge, Valvoline 0w20 and the rest of the 0w20 syns available at Walmart? Just wondering if the Euro ratings matter here?