Street Legalâ„¢ 0W20 dexos1 oil is a full synthetic Gen 2 formula (GF-6) motor oil. We formulate it with select synthetic base oils and a state-of-the-art additive system. As a result, it delivers exceptional, trusted engine protection and peak performance. Moreover, our 0W20 dexos1 oil provides added resistance to sludge formation and varnish deposits during stop-and-go driving. It also maintains outstanding wear protection under severe driving conditions. Learn about oil viscosity and why it's the most important physical property of motor oil.