The Bio-Ultimax 1000 Hydraulic Fluid from Renewable Lubricants is a biodegradable, vegetable-based formula that can perform in hydraulic systems and offers anti-wear, anti-rust, anti-oxidation, anti-foam, and demulsibility properties, the company stated. The Bio-Ultimax 1000 passes both A and B Sequences of the ASTM D-665 Turbine Oil Rust Test and features a high viscosity index that the company claims goes beyond synthetic levels. Coming in 1-gallon jugs or 5-gallon pails, the hydraulic fluid comes in ISO 32, 46, 68, and 100.