Is this also the same fluid recommended for a '88 300SEL? My moms car is well overdue for a tranny fluid and filter change. The gasket has been leaking for awhile and we have refilled with Dexron III when it gets low and haven't had any issues, so I think this is the fluid to use for the '88. I think it has the 722.3 transmission as well? Also wondering if it is just a simple remove the pan, drain fluid and reinstall new filter kind of deal, or is there a special technique for draining/refilling on these?

Thanks!