not any more that they lower metal levels. 20-50 vr-1 racing valvoline is highest phosfurous/zinc, more heavy metal contain than mobil-1. its equal to amsoil but less than 1/2 price. im amsoil dealer costs me 6.25 per quart plus shipping. vr-1 is 3.00 my cost at advanced auto. or if you can get a deal on motorcycle oil thats the way to go motul bike oil is still unregulated by tree huggers at epa and its loaded with heavy metal. i have stavley oil engineers report on all oil. and motul is the best phosfurous/zinc content