Hi , I did a search on this came up empty . First the 6" has sleeve bushings , my manual is for a 618 and it says sae 20 for the Timkens . What oil should I use ? Also is there a manual for the 6 " ? Are there any differences between the 6" and the 618 besides the Timken head stock bearings and the rear 3 hole table riser mount ? Well OK I know the counter shaft frame is different . Thanks for any response .