here are four basic classes of engine oil used in car maintenance today. Your owner's manual will explain which type of motor oil your vehicle needs. It is important to always use the correct type of motor oil. The four types of motor oil are:
Conventional petroleum-based motor oil - This is the most common type of motor oil used in vehicles.
Synthetic motor oil - a lubricant made up of artificial chemical compounds derived by breaking down and rebuilding petroleum molecules.
Synthetic blend motor oil - a combination of common petroleum motor oil and synthetic motor oil.
High mileage oil - This type of motor oil is most commonly used in commercial vehicles and contains additives and seal enhancers that reduce leaks.