When the vehicle is cornering or accelerating and decelerating, oil in the oil pan will lean or splash. To prevent this, the baffle is assembled in the pan of a stock engine. Though, in terms of sports driving, it is almost impossible to achieve it's purpose because the size of the baffle is restricted to cut down the production cost. If oil leans to one side largely, air goes in to the pipe instead of oil and interrupts continuous oil lubrication. Without oil, metal surface contact directly each other, then the temperature rises explosively and causing extreme wear. On the other hand, Tomei movable baffle plate is made to achieve stable oil lubrication at any situations such as turning, acceleration, and deceleration. It will secure the improvement of engine performance from street use to drag racing or circuit runs.