Maxima ATV Full Synthetic 4T 5W50 Engine Oil - 1LMaxima Racing Oil is a full synthetic, ester fortified 4 stroke engine oil specifically formulated for ATV engines. The Synthetic, oxidatively stable formulation combines surface active esters with a shear stable polymer system to provide excellent film thickness and viscosity stability across all operating temperatures. Advanced, proprietary additive system reduces temperatures and increases power output while keeping your engine running clean,