I own a Performance Tool 3 1/2 ton low profile jack. Works very well. After a half dozen years, i want to change the jack's hydraulic jack fluid. So I picked up a bottle of ISO AW32 anti-wear hydraulic jack oil at our local Crappy Tire before I consulted the manual. The Performance Tool jack manual calls to "...use only hydraulic fluid with a rating of SAE 20 for refills." The manual also calls for the fluid to be re-filled every three (3) years.... Question: Can I safely use the ISO AW32 oil in the jack or should I hold out for SAE 20, and if so, where can I find it? Here is a: SAE-to-ISO Oil Conversion Chart According to the chart, it appears that I should be looking for a SAE 20W/AW68 hydraulic oil. Any help here would be appreciated.