MAINT1 AND MAINT 2 MENUS

WOULD LIKE TO KNOW IF ANYONE IS USING A GOOD SERVICE MENU THAT ALSO FOLLOWS THE MAINT 1 AND MAINT 2 SCHEDULES FOR GM VEHICLES.SEEMS WE HAVE MORE AND MORE TAKEN AWAY BY FACTORY AS FAR AS WHAT WE SHOULD OR SHOULD NOT RECOMMEND AS MAINTENACE ITEMS