The Dangers of Using the Wrong Viscosity Oil in a Motorcycle Engine

The Consequences of Incorrect Viscosity Oil

Did you know that putting the wrong viscosity of oil in your motorcycle engine can cause damage? Yes, it's possible, but don't worry, if you top off with the incorrect oil to avoid low levels, that's fine. However, it is crucial to change it as soon as possible.

Some individuals believe that they are "blending" the viscosity when mixing different types of oils. Unfortunately, this is not accurate. The viscosity of the oil is chosen to provide the best sheer hammer cushion and thermal performance, and incorrect viscosity can lead to significant engine damage.

A notable example of this is the case of FORD Motor Co. They highlighted the importance of using the correct oil viscosity in their training class. Poorly chosen oil, such as heavier weights, can lead to "oil starvation." The molecular size is too large, thus failing to provide sufficient protection. Therefore, it is paramount to use the recommended oil to avoid negative outcomes.

Understanding Oil Viscosity

The first number in the oil code represents the 'thickness' of the oil when cold. For example, a 20W/50 oil has a cold thickness of 20. A 15W/50 might not hurt the engine but a 10W/50 could be too thin, causing smoking and excessive wear. Therefore, the general rule is to stick to the first number and the second number should be the highest available, such as 15W/60, which is a higher quality oil when it is hot and under heavy load.

Handling Special Circumstances

Heavy oil, such as a 40W, was traditionally used to reduce blue smoke on old engines. However, modern engines are engineered to use lighter synthetic oils, which can improve fuel efficiency.

Engine components like bearings and oil galleries are designed to function optimally with a specific grade of oil. Using oil that is too thick can lead to incorrect flow, while oil that is too thin can lead to rapid shearing on the bearings. A real-life example is a diesel pickup that broke a piston skirt off within one block of driving after switching from 15W/40 oil to 0W/40 oil for winter. The belief that this was the right thing to do proved to be incorrect.

Conclusion

To ensure the longevity and performance of your motorcycle engine, it is essential to adhere to the recommended oil viscosity. Switching oil types can lead to significant damage, including engine overheating, so always invest in the correct oil for the job. Regular maintenance and monitoring can help prevent such issues and ensure that your motorcycle runs smoothly for years to come.

Remember, your motorcycle engine should be treated with the same care as a precision instrument. Neglect can lead to costly repairs and decreased performance. Stay informed and proactive about your vehicle's needs to keep it running efficiently and safely.