Is 10W-40 Thicker Than 5W-30? Understanding Engine Oil Viscosity

Discover why 10W-40 is thicker than 5W-30 and learn about engine oil viscosity ratings.

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Yes, 10W-40 oil is thicker than 5W-30. The first number (before the 'W') refers to the oil's viscosity at cold temperatures, with 5W being thinner than 10W. The second number refers to viscosity at operating temperatures, making 40 thicker than 30. This results in 10W-40 being thicker overall under high temperatures.

FAQs & Answers

  1. What does the 'W' in oil ratings stand for? The 'W' stands for winter, indicating the oil's viscosity in cold temperatures.
  2. Can I use 10W-40 in place of 5W-30? Yes, but it depends on the vehicle's specifications; always check the owner's manual.
  3. What is the significance of oil viscosity? Oil viscosity affects the lubricating ability of the oil, impacting engine performance and protection.
  4. How often should I change my engine oil? Typically, engine oil should be changed every 5,000 to 7,500 miles, but refer to your owner's manual for specifics.

Watch More

For more insights on engine maintenance and oil types, check out our video on the best engine oils for your vehicle and tips for maintaining oil health!

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  2. 5w30 vs 5w40: Which Oil is Thicker for Your Engine? Discover if 5w30 or 5w40 oil is thicker and which is best for your vehicle's performance. Learn about viscosity and operating temperatures.