Under the condition of a high RPM, a high temperature, and a heavy condition as driving the circuit etc. , the power steering oil will leak from the reserver oil tank.

And, the steer feeling decreases when air mixes with oil (Cavitation) by a decrease of oil and the wave on the surface of oil, and the deflate of the mixed air is needed. " Reserver tank attachment" prevents the oil leak by easily installing it between a pure tank and the filler cap.