I am already sold on D1/SUV and have'nt even used it. 0w-40 has Supersyn PAO and no esters verses D1 with loads of esters and no factory certs. Currently trying M1 0w-40 in a family car and it does burn off a lil fast. Planning on D1 for that car and a 2000 Mercedes, is that a good idea? I see there is no Supersyn on the D1/SUV bottle, that's Mobil's most advanced basestock, but D1 can do better without it? Curious about the comparison of these 2 oils.