These letters are based on a group of laboratory and engine tests that determine the oil’s ability to protect the engine from wear and high-temperature deposits and sludge.
API's latest service standards are SP for gasoline engines and CK-4 for diesels. You’ll also notice a two-character service designation on the container. Always choose an oil from a brand that displays the starburst symbol that indicates the oil has been tested by the American Petroleum Institute (API). For regular use in moderate temperatures, what’s listed in your owner’s manual is fine. You should adjust which weight and type for the seasons and your expected use of the car, which we’ll explain below.
That number refers to the viscosity (or thickness) of the oil that you should use. The owner's manual for your car will list its recommended oil weight, whether that's a standard format like 10W-30 or something more unusual. While there is a mountain of information about the various oil choices, the first step is honestly quite simple: Look in your car’s manual. Given all the options for motor oil options out there, choosing the right oil for your car might seem like a daunting task.
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