ATV Repair and Maintenance Polaris substitute oils for 325 magnum? November 6, 2015 I’m doing a full fluid change in my 2001 325 magnum 4×4. I use mobile 1 0w40 for main engine oil but what should I use for transfer case/transmission, differential, and front hub oil? chas Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related