The numbers in motor oil ratings, such as 5W-30 or 10W-30, indicate the oil's viscosity and performance at different temperatures. The first number (5W or 10W) represents the oil's viscosity at low temperatures, while the second number (30) indicates its viscosity at high temperatures. Using the recommended oil viscosity for your engine helps ensure optimal performance, fuel efficiency, and protection against wear. Choosing the right oil also aids in proper engine function across varying operating conditions.
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