Uses a traditional oil base, fortified with Active Cleansing Agents to continuously prevent dirt and contaminants from turning into performance-robbing deposits. This helps keep engines clean and responsive. Pennzoil motor oil helps clean out sludge with first oil change and keeps cleaning all the way to the next oil change. Specially formulated to provide extra protection against the harmful effects of stop-and-go driving and high and low-temperature engine operation. Can be mixed with other synthetic and mineral oils and is recommended for use in all vehicle applications under all driving conditions. Exceeds API SN and ILSAC GF-5.