Which Motor Oil is Thicker: 10W30 vs 10W40?

Learn the key difference between 10W30 and 10W40 motor oil viscosity and which is better for high-temperature engine conditions.

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10W40 motor oil is thicker than 10W30. The difference in viscosity is evident in the operating temperature of the engine. While both oils have the same viscosity when the engine is cold (10W), the 40 indicates that 10W40 remains thicker at higher temperatures compared to 10W30. Thus, for engines operating under higher temperature conditions, 10W40 might be the preferable option.

FAQs & Answers

  1. What does 10W30 and 10W40 mean in motor oil? 10W30 and 10W40 refer to the viscosity grades of motor oil. The '10W' indicates the oil's viscosity at cold temperatures, while '30' or '40' refers to the oil's thickness at high operating temperatures.
  2. Is 10W40 better than 10W30 for hot climates? Yes, 10W40 is thicker at high temperatures than 10W30, making it a better choice for engines operating in hot climates or under heavy load to ensure adequate lubrication.
  3. Can I use 10W40 instead of 10W30 in my car? While 10W40 can be used if recommended by the manufacturer, always check your vehicle’s manual as using oil with incorrect viscosity can affect engine performance and warranty.

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