Dometic SeaStar Hydraulic Steering Fluid Gallon. Formulated to provide the best performance for SeaStar/BayStar steering systems. A perfect blend of viscosity stabilizers, anti-wear agents and corrosion inhibitors will ensure maximum steering life performance. Dometic recommends SeaStar Hydraulic Fluid ONLY for use in their hydraulic steering systems. Any non-approved fluid may cause serious damage to the steering system resulting in possible loss of steering, causing property damage, personal injury and/or death.