Mag 1 (62891-6PK) dexos1 5W-30 API:SN/GF-5 Motor Oil - 1 Quart Bottle, (Pack of 6) Mag 1 dexos1 is formulated to prevent engine wear; even in the most severe GM tests, Mag 1 dexos1 exceeds the performance limits by 65 percent Mag 1 dexos1 keeps pistons cleaner than GF-5 minimizing oil consumption and maintaining power and compression performance Mag 1 dexos 1 chemistry significantly outperforms the industry requirement, reducing engine sludge to near zero Mag 1 dexos1 conserves emission, protecting the car's catalyst system to help protect the environment Exceeds GM dexos1 specifications for world wide warranty requirements for all GM automotive gasoline engines currently in use