The difference between the key component structures of the two models is the core reason for the above conclusions. In a four-stroke motorcycle, the engine , wet clutch and gearbox are all mounted in the same unit, so the three components use the same lubricant. In contrast, on passenger cars, it is clear that the engine , gearbox and clutch are separate, and the lubricant used in each component is designed for the mechanical construction and unique conditions of the component.
1, the difference between the engines
The four-stroke motorcycle engine runs at a higher speed than the passenger car. Their power density ratio is higher, so the pressure on the lubricant is also greater.
The difference in cooling system also affects the choice of lubricant. Many four-stroke motorcycles use air-cooled systems, especially those that have a small number of cylinders, so the operating temperature range of the engine varies widely. Passenger car engines mainly use oil-cooled systems, so they can better maintain temperature stability and change the operating temperature. It is also worth mentioning that the operating temperature of a motorcycle engine using an air-cooled system will be closer to the higher part of the temperature curve.
The last point is that the oil sump of a motorcycle is usually smaller than the passenger car, which means that the lubricating oil can be carried less, so the lubricating oil temperature of the motorcycle is higher than that of the passenger car.
2, motorcycle oil faces challenges
The correct formulation of motorcycle oil is critical because extreme conditions are an unavoidable challenge. Lubricants must guarantee good engine durability, gear durability and fast shifting feel at extremely high temperatures , while also preventing clutch slippage, improving or maintaining fuel economy.
Today, a new type of passenger car engine oil in order to meet fuel economy requirements for friction properties have been adjusted, but the friction modifier may have a negative impact on the performance of the clutch. Therefore, this type of lubricant is not suitable for motorcycles equipped with wet clutches .
The reason why the passenger car engine oil for four-stroke motorcycle engine remains, the following three main reasons: lack of awareness of the technical problems, logical thinking simple, cost.
But as discussed above, the passenger car engine oil can not provide the best performance for four-stroke motorcycle engine. These three reasons are insignificant in the face of this fact.
The use of four-stroke motorcycle-specific lubricants is the right way to ensure a driving experience and extend the life of your equipment.
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