What is the difference between 5W and 10W engine oil?

[Chiron]

The grade number after the engine oil classification indicates its viscosity specification. The smaller the number before 'W', the better the low-temperature fluidity of the engine oil. The following are the differences between 10W and 5W engine oil: Different low-temperature viscosity; 10W engine oil: 10W engine oil has poorer low-temperature viscosity compared to 5W, with worse low-temperature fluidity and a higher applicable minimum temperature. 5W engine oil: 5W engine oil has better low-temperature viscosity compared to 10W, with better low-temperature fluidity and a lower applicable minimum temperature. Different applicable maximum temperatures; 10W engine oil: 10W engine oil has a higher applicable maximum temperature compared to 5W, with a wider applicable temperature range. 5W engine oil: 5W engine oil has a lower applicable maximum temperature compared to 10W, with a narrower applicable temperature range. Different wear reduction effects. 10W engine oil: 10W engine oil provides better wear reduction for parts compared to 5W. 5W engine oil: 5W engine oil provides poorer wear reduction for parts compared to 10W.

[Bo]

When I first started learning about cars, I was confused about what those numbers on engine oil meant. Simply put, 5w and 10w refer to the oil's fluidity at low temperatures. 5w flows faster in cold weather, such as at -20°C, making it easier to lubricate the engine during startup, reducing wear and noise. 10w is fine in warmer areas but thickens when it gets cold, which might make starting the engine harder in winter. When I used 5w, I found that starting the car in the cold northern winters was super smooth, while 10w worked fine in southern summers and autumns but required longer preheating in winter. Choosing the right oil depends on the climate type recommended in your car's manual—using the wrong one could damage the engine. Generally, 5w suits a variety of temperatures, and while it's slightly more expensive, it's worth it for engine protection.

[PatrickAnn]

With over 20 years of driving experience, I've gained some insights into motor oil selection. 5W oil has significantly better low-temperature fluidity than 10W, especially when starting the car in sub-zero conditions - the 5W can pump oil to critical components faster, preventing dry friction damage. While 10W's higher viscosity works fine in warmer climates, it reveals issues in cold weather like increased fuel consumption or hard starting. Remember: oils with lower winter grade numbers perform better in cold temperatures, matching engine design to prolong service life. Always prioritize using the manufacturer's recommended oil grade during maintenance - don't cheap out by switching brands randomly. Before winter sets in, I always switch to 5W oil to prepare for harsh cold, which eliminates multiple cranking attempts while protecting engine components.

[VanBella]

The core difference between 5W and 10W engine oil lies in cold-start performance. 5W flows smoothly in extreme cold temperatures like -30°C, protecting the engine from wear. 10W performs well around 0°C but becomes viscous in low temperatures, resulting in slower starts. The number indicates cold-weather adaptability - smaller is better. Using the wrong oil may increase fuel consumption or cause component damage. Always consult your vehicle manual and consider local climate when selecting the appropriate grade during maintenance, and change oil regularly to maintain lubrication. In northern regions, I insist on using 5W to ensure worry-free winter operation - it's highly recommended for reliable performance in cold environments. Simply put, temperature matching is key - never overlook maintenance details.