AMSOIL Biodegradable Synthetic Hydraulic Oil is a premium performance, readily biodegradable oil manufactured with synthetic esters. Its high viscosity index provides excellent all-season performance, reducing the need for seasonal change-outs. It remains fluid at low temperatures due to its low pour point to promote smooth, efficient operation in cold weather. Biodegradable Synthetic Hydraulic Oil is compatible with most common seal and hose materials to help prevent leaks. read more...