- Joined
- Apr 10, 2021
- Messages
- 618
I looked through the literature on vintagemachinery but found no help. My Monarch 60/61 with about the same speed range takes DTE Heavy/Medium. I'm assuming you will flush the system first and then add new oil. I'd go with heavy medium and fill it1/2-3/4 way, run it slow and see how the oil flows through the system. If it seems to flow slowly and not keep up, you could go lighter but I think DTE Light is too thin for a machine running that slow unless the drive chain runs faster and gears down at the spindle. Vactra #2 is kind of the go to way oil. Dave