Before you pick out new engine oil, it's important to check the rating. What does a 5W-30 oil rating tell you?
Answer The oil's viscosity at winter and summer temperatures.
Engine oil is rated by viscosity, or thickness. The "5W" indicates thickness at 0 degrees Fahrenheit and the "30" is at 212 degrees Fahrenheit. The "W" stands for Winter.
Asked by Dan Henry · Last updated 5 years ago · 440.5K views
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