API | Oil Categories

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Ratings and reviews are provided by customers who have either purchased a vehicle or visited a dealership for service. How are ratings and reviews collected? Customers are invited to participate in a survey administered by MaritzCX, an independent, third-party supplier.

Service Reviews. Find good folks to fix your car. Cars for Sale. Find the right car for you. Car Recalls. Make sure your car is safe to drive. Write a Review. Join. Sign In. Dealer Panel. Dealer Panel. Sign In Join. Reviews Profile Settings Sign Out. Dealer Reviews. Service Reviews. Cars for Sale. Write a Review. API Engine Oil Classification The service rating of passenger car and commercial automotive motor oils is classified by the American Petroleum Institute (API). The program certifies that engine oil meets certain Original Equipment Manufacturer (OEM) quality and performance standards. The service rating is shown in the API "Service Symbol Donut" on the product label.