At Quaker State, oil isn"t just tested before it goes in the bottle, but after it’s gone through thousands of miles of real-world torture. And used Quaker State Advanced Durability still passes these critical tests for brand-new oil, even when it’s ready to be replaced. Quaker State Advanced Durability motor oil minimizes friction-related wear 3 times better than the wear standard set by top American and Japanese automotive manufacturers, and meets or exceeds the latest oil standards for protection under high temperature and severe service conditions.