Harmful deposits are constantly attacking your engine’s precious metal components, creating friction and robbing your engine of performance and fuel economy. So you can protect your engine by using any of the Conoil lubricant brands. They are specially formulated to guarantee all-year-round protection, high-level performance and superior fuel economy for your car. As a mark of excellent quality and world-class standard, the Quatro brand carries the Donut symbol of the American Petroleum Institute (API), which is a globally accepted symbol for top quality engine oil.