Choosing the Right Engine Oil for Your RE Thunderbird 35

When it comes to maintaining the performance and longevity of your Royal Enfield RE Thunderbird 35, selecting the correct engine oil is crucial. This article will guide you through the considerations and recommendations for the appropriate oil grade, while also addressing the suitability of 20W40 oil and the benefits of synthetic and semi-synthetic oils.

Understanding Engine Oil Grades

Engine oils are typically categorized by their viscosity rating, such as 20W40 or 15W50. The W in the grade stands for winter, indicating the oil's performance in cold temperatures. The number before the W (e.g., 20 or 15) indicates the viscosity of the oil at low temperatures, while the number after the W (40 or 50) indicates the viscosity at high temperatures. A lower number before the W means better flow in cold temperatures, while a higher number after the W means better protection at high temperatures.

RE Thunderbird 35 and Engine Oil Recommendations

Royal Enfield recommends using 15W50 engine oil for the RE Thunderbird 35. This grade of oil is specifically tailored to meet the requirements of the engine's design and operating conditions, providing optimal protection and performance. It is recommended to follow the manufacturer's guidelines for the best results.

However, some owners might wonder if 20W40 engine oil could be used as an alternative. While it is possible to use 20W40, it's important to consider the following:

Engine Protection Higher viscosity 15W50 oil is generally better for engine protection, especially in high-load situations or under extreme temperatures. 20W40 oil might not provide the same level of protection. Performance and Noise Using 20W40 oil could result in engine overheating, especially in hot climates or during extended use. Additionally, the increased viscosity might lead to a slight increase in engine noise and potential gear shifting challenges. Compatibility 20W40 oil may be more challenging to start in cold temperatures, as it is thicker than 15W50 oil.

Advantages of Using Higher-Quality Oils

For those seeking to enhance the performance and comfort of their RE Thunderbird 35, consider upgrading to semi-synthetic oils such as Motul 5100 or Castrol PowerCruise. These oils offer improved performance, smoother gear shifts, and reduced noise, all while maintaining the engine's protection level.

For those who prioritize cost and performance, consider the following:

Synthetics Synthetic oils, like Motul or Repsol, offer better lubrication and protection, especially in high-load situations. They are known for their ability to handle high temperatures and maintain smooth engine operation. Semi-Synthetics Semi-synthetic oils, such as Castrol PowerCruise, offer a blend of mineral and synthetic oils, providing excellent lubrication and protection without the high cost of fully synthetic oils.

Conclusion

In conclusion, while it is possible to use 20W40 oil in your RE Thunderbird 35, it is highly recommended to stick with the 15W50 grade as recommended by Royal Enfield. For those looking to enhance their riding experience and engine protection, semi-synthetic and synthetic oils are excellent alternatives that can provide smoother operation, quieter performance, and better heat management.