Automobiles

10W-30 Vs. 10W-40: What's The Difference Between These Engine Oils?

Motor oil comes in a variety of forms, designated by pairs of numbers, but the most common two are 10W-30 and 10W-40. What's the difference between them?

SlashGear Auto

published: Mar 11, 2025

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Motor oil comes in a variety of forms, designated by pairs of numbers, but the most common two are 10W-30 and 10W-40. What's the difference between them?

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Cars

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