The hydraulic autopilot steering system in my boat uses a biodegradable soy-based hydraulic fluid, and it’s at least 20 years old. Similar non-marine products a

The hydraulic autopilot steering system in my boat uses a biodegradable soy-based hydraulic fluid, and it’s at least 20 years old. Similar non-marine products are readily available on amazon. https://www.pocomarine.com/shop/garmin-tr-1-biosoy-hydraulic-oil/ https://www.pocomarine.com/shop/garmin-tr-1-biosoy-hydraulic...