Clean hydraulic fluid is important for the long term durability of the ABC system. The Active Body Control (ABC) can compensate within milliseconds to the rolling and pitching movements of the body when starting, braking and cornering. Completing the recommended interval changes at 50,000 miles can extend the longevity of your car and improve performance. The ABC Kit is designed specifically for this service using both Pentosin OE CHF11S hydraulic fluid (10 liters) and the OE Mercedes filter.