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MAG 1 Full Synthetic Motor Oils with FMX are state of the art, advanced technology, synthetic motor oils which provide the highest level of engine protection available, even under the most severe operating conditions. The 100 percent synthetic base oils in MAG 1 provide exceptional resistance to high temperature oxidation thickening. Our proprietary additives prevent sludge formation commonly caused by the 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.