Pennzoil motor oil is a traditional oil base, fortified with Active Cleansing Agents to continuously prevent dirt and contaminants from turning into performance-robbing deposits, helping to keep your engine clean and responsive. In fact, Pennzoil motor oil cleans out up to 40% of sludge in the first oil change and keeps cleaning all the way to your next oil change. And it"s backed by the Pennzoil lubrication limited warranty.