The best motor oil for most car engines depends on the relative age of the car. Synthetic motor oils, such as Amsoil Synthetic Blend 15W-40 Heavy Duty Motor Oil and Mobil 1 10W-30 Full Synthetic Motor Oil, are best for m... More »

The best way to find the correct engine oil for a car is to check the owner's manual for the manufacturer's recommendations. This lists the oil that the manufacturer designed the engine to use. More »

The best diesel oil for an engine depends on the type of vehicle and how often the oil is changed. However, most diesel engine oils should be heavy-duty, fully synthetic products designed with high performance in mind. More »

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The best time to check the oil of a car depends on its age; older cars require cold engines for oil checks for the most accurate readings, while dipsticks on newer cars are made to accommodate warm engines. Whenever the ... More »

The API rating system for motor oil grades oil based upon its performance in a variety of tests that determine its suitability for certain kinds of engines. The American Petroleum Institute uses its Engine Oil Licensing ... More »

The 2007 Saturn Ion was offered with three different engines and all of them require 5W-30 motor oil, according to AutoZone. Some of the recommended brands are Valvoline, Quaker State, Havoline, Mobil 1 and Pennzoil. More »

Vehicle and equipment owners use non-detergent motor oil for the purpose of preventing overheating and to maintain the proper functioning of engines. Non-detergent oil works by lubricating an engine and cooling the inter... More »