Mag 1 1-quart 5W-30 Full Synthetic Oil is made from 100% synthetic base oil and is Dexos1 certified to meet GM warranty requirements. It is formulated with high phosphate retention ZDDP to provide extended wear performance, even in the most severe industry tests. This oil keeps pistons cleaner, minimizing oil consumption and maintaining power and compression performance. It maximizes fuel economy and reduces engine sludge to near zero.