Mag 1 Dexos1 Motor Oil is a state of the art, advanced technology motor oil which provides the highest level of engine protection available, even under the most severe operating conditions. Mag 1 dexos1 provides exceptional resistance to high temperature oxidation thickening. Mag 1's sophisticated additives prevent sludge formation commonly caused by moisture and combustion by-products. Exceptionally high viscosity indices minimize cold weather oil thickening, which greatly reduces battery drain and engine wear, even at subzero start ups.