Royal Purple motor oil is a tough, long life, high performance oil that delivers superior protection and enhanced performance. It gains its performance advantages from a blend of synthetic oils, plus Royal Purple's proprietary, synthetic Synerlec additive technology, which greatly reduces engine wear, including ring, cylinder, and bearing wear. It's extremely tenacious, adheres to engine surfaces, and remains after shutdown, providing protection upon initial startup. Royal Purple motor oil also extends oil drain intervals. Less oil is purchased and less oil is disposed of it's good for your vehicle and good for the environment. Multi-grade and straight-grade oil is available. Royal Purple motor oil is compatible with other mineral and synthetic motor oils.