You can find issues with all the companies. - Amsoil and the "4-ball wear BS", Castrol and the Group III charging it as it were a true synthetic", Mobil 1 with "Nothing outperforms M1" yada yada yada....Mobil is trying to distinguish itself from the crap that exists on the shelf at Walmart. Actually the new Dino/blends are great buys. But Castrol Syntec is a huge rip off. Go back and look at the UOA's of all non-German Syntec. Oil cuts out at very low mileage. I guess I look at it different. Mobil gives people the only true PAO on the shelf and I've yet to see proof that engines wear out any quicker due to +/- differences of 10ppm in Fe wear. Annoying YES, a problem? Not so sure.....on the fence at the moment.