The role of engine oil (engine oil) is to lubricate, clean and cool engine parts. The engine oil needs to be replaced regularly, but when will it be replaced? Is it by time or mileage? In fact, there are many different theories in the market. The helmet King will thoroughly explain the characteristics, selection, replacement time and so on of the engine oil for everyone.

The maintenance chain is commonly known as the "washing chain". In fact, the chain is almost exclusive to the motorcycle parts of the stick wave bike. As an important part that brings power from the engine to the tires, its importance can be said to be inseparable from the tires. Up and down. However, compared to suspension, brakes and other components, the chain is located in an inconspicuous position, and has no attractive appearance and modification method, so it often makes some drivers ignore its existence.