I thought I understood the Dillon Lubrication needs and how to do it. Even chastisied Jack for abusing his poor 550. My machine is not that old (3 years maybe?) and it's loaded maybe 60K round give or take a little so that a decent amount but not excessive by any means. Anyway. the factory line is grease for the pivots, engine oil for the ram. Well my machine didn't have the "bounce" in the handle it used to when you pushed and released from the prime stroke with no case in the shellplate. So I took it apart and saw some galling on the aluminum link on only the left side. I have been religious about using my pump needle luber for the holes. It's sometimes hard to get the grease to go in but I work the handle while I do it and I thought I got grease in the things. Apparently not. Anyway. The Dillon rep over a Brian Enos forums said Kroil (a thin penentrating lube) is fine if you want to use something thinner. You just need to use it more often. Other oils I am sure would work as well as long as the migrate around the bearing. I have loosened the nuts a little on the bottom links and now it's a lot easier to get the grease in those areas. Upper ones are still a little harder. I may try some Kroil but for now when I push on the end of the grease gun I get grease out the side of my bearing so it is going in now. Just thought I would share. New 550's have different bearing shafts that make it easier for the grease to work it's way around the bearings and also have grease fittings. Not sure if they changed the upper at all. Never seen a picture of one.