Should I use 5w40 or 10w40 for motorcycles in summer?
2 Answers
Both can be used. The two oils have the same high-temperature resistance, but the former has lower viscosity than the latter, and the former has better starting performance than the latter. Here are some introductions about motorcycle oil: Introduction: Motorcycle oil is the abbreviation of motorcycle engine lubricating oil. Motorcycle lubricating oil usually includes motorcycle engine lubricating oil (referred to as motorcycle oil), motorcycle gear oil, motorcycle shock absorber oil, etc. Model: W is the abbreviation of winter in English. The presence of W indicates that the oil is suitable for all seasons. The number after W indicates the viscosity of the oil. The larger the number, the thicker the oil. The number before W indicates the starting performance of the oil. The smaller the number, the better the starting performance of the oil.
As a seasoned motorcycle rider with over a decade of experience, let me share some insights on choosing engine oil for summer. Both 5w40 and 10w40 are multi-grade oils, with the main difference lying in the first number. 5w indicates better low-temperature fluidity, making it ideal for cold starts in winter when the oil won't be too thick. On the other hand, 10w performs slightly worse in winter but has minimal impact in summer. The key factor is the second number, 40, which represents high-temperature viscosity. In summer, when temperatures soar and oil temperatures can easily reach 70-80 degrees Celsius, higher viscosity oil forms a thicker film, providing better engine lubrication and reducing wear. Based on my experience, unless you live in a perpetually cold region, using 10w40 in summer is more reliable—it results in quieter engine operation and smoother performance at high speeds. Don't forget to check your motorcycle's user manual; most manufacturers recommend 10w40 or similar grades. Also, remember the oil change interval. Oil degrades faster under high temperatures, so it's advisable to change it every 5,000 kilometers or every six months to maintain engine health and prevent overheating-related issues.
