I don't know what the fluid change interval (if any at all) for the Hydraulic self-leveling suspension.

The fluid change interval required by Mercedes Benz for the Brake Fluid and Radiator coolant is as follows:

1. every two years for the brake fluid.

2. every three years for the radiator coolant.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".