The difference between PSF and HSF oil
HSF oil, or "hydraulic steering fluid," is a type of lubricant that is used in hydraulic steering systems. It is typically made from mineral oil and is formulated to provide a high level of lubrication and protection for the various components in a hydraulic steering system.
HSF stands for "Hydraulic Steering Fluid" and is used in boats to lubricate and power the hydraulic steering system.
Both are lubricants, but they are formulated for different types of systems and should not be used interchangeably.
In short, PSF oil is for power steering systems, HSF oil is for hydraulic steering systems.