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 helps clean out sludge lesser oils leave behind and keeps cleaning all the way to your next oil change. No leading conventional oil helps keep engines cleaner and no leading conventional oil provides better wear protection. Pennzoil conventional 30 is recommended for use in all vehicles requiring the use of SAE 30 viscosity grade engine oils under all driving conditions. Pennzoil conventional 30 can be mixed with other synthetic and mineral oils and is recommended for use in all vehicle applications under all driving conditions. Helps prevent sludge and other damaging deposits.