Mercury - SAE 0W-30 Full Synthetic Power Steering Fluid Verado & Zeus Systems 858077K01. Overview. Precision steering isn't just about control - it is about trust. When you turn the wheel, you expect your boat to respond instantly, without noise or hesitation. Mercury SAE 0W-30 Full Synthetic Power Steering Fluid keeps that connection steady and reliable, even under the toughest marine conditions. It's made specifically for the advanced steering systems powering Mercury Verado outboards and Joys