That may be one of the 'Never Oil" Vikings. The parts where oil-impregnated, which only lasted about 25-30 years. Then you had to clean all the gunk out and treat them as oil-able machines- and they it was pretty much going by visual inspection - if the parts rubbed then add a drop of oil.
IF the machine is new to you, and is not moving freely - you have a much bigger problem to deal with than adding a bit of oil. Don't try to force anything, the plastic parts that are now stuck together will break.