Difference Between 5w30 And 5w40

5W30 is thinner at operating temperature, offering better fuel efficiency, while 5W40 is thicker , providing enhanced engine protection under high loads, long-distance driving, or hot climates.

What is the difference between 5W-30 and 5W-40 engine oil? Which one is better?, Wondee Autoparts

Compare 5W30 vs 5W40: optimize engine protection, fuel efficiency, and performance for modern cars, fleets, and hot climates.

Motor oil classifications help you to choose the right oil viscosity for different driving temperatures, and keep your engine healthy for longer.

What’s the benefits to running 5w40 instead of 5w30

5w40 and 5w30 motor oils have winter viscosity grades of five , meaning they are effective down to temperatures of -30°C, and are more viscous at very low temperatures, compared to, say, 10w40 oils. Resultantly, 5w40 oils are likely to be used in higher-performance engines that have higher

The VW manual said to use 5w40, or 5w30 if 5w40 isn't avaliable, so I have been using Mobil1 5w30 for 20000 miles on my 02 1.8T Jetta. I was just thinking if I should change over to 5w40 (Valvoline or Havoline). Does it make that much of a difference? Yes, I want my engine to last as long as

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The primary difference between 5W-30 and 5W-40 lies in their high-temperature viscosity and performance . Both grades share the same low-temperature “5W” rating, so they flow similarly when the engine is cold.

If much truck with 147k miles on it calls for 5w30 from the factory is it ok if I use 5w40? Any problems ? Click to expand Suppose you know the oil PSI at a given RPM while at operating temperature when it was new. Personally thinking higher viscosity would bring the PSI up now. Maybe 5w40 would do that but those are two unknowns. I think OP meant 'my' truck and not 'much' truck, autocorrect sucks as always.

Normally, the 5w40 is often applied for high-performance engines, with high operating temperatures, and heavy loading . For vehicles that are not designed to drive at high loads. 5w30 is the best option for you in this situation. Published February 25, 2025

Due to their lower temperature range, they also have longer lifespans than 5W40 engine oils . To promote engine health and strike a balance between performance and protection, always select the correct oil.

Know the differences between 5W-30 and 5W-40 oil? Our guide goes through their benefits and differences to help you choose the right oil type for your car.