The most basic is conventional motor oil, which is refined from crude oil and provides adequate protection for simple engine designs and light driving conditions. The number after the dash indicates the oil's thickness at the engine's normal operating temperature.
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Look for the "S" series, such as SN or the current SP, which denote the level of performance and additive package designed to protect against wear, sludge, and deposits. For diesel engines, the "C" series, like CK-4 or FA-4, is the standard.
If you frequently engage in stop-and-go traffic, make short trips that don't allow the engine to fully warm up, or drive in dusty or sandy conditions, your oil is subjected to more stress and contamination. Modern multi-grade oils are engineered to provide the protection of a thick oil when hot and the fluidity of a thin oil when cold, ensuring consistent lubrication in all conditions.
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Conversely, a driver with a highway commute in a mild climate might find a high-quality conventional or synthetic blend sufficient for their needs. Understanding the Viscosity Grade on the Bottle The first hurdle for most drivers is deciphering the numbers and letters on the motor oil container, such as 5W-30 or 10W-40.
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