Protect your vehicle and improve its performance with Quaker State Defy High-Mileage Motor Oil. It is formulated with extra anti-wear additive to help reduce wear on worn engine parts, especially in high-temperature situations. The seal conditioners in this 1-qt container of Quaker State motor oil help reduce oil leakage. A higher viscosity helps improve engine sealing, thus increasing compression and reducing blow-by. Quaker State Defy High-Mileage Motor Oil is formulated to play nicely with catalytic converters and other emission equipment, helping to keep your vehicle performing well, even as it ages.