I’m in the process of doing this to my 951, and this last owner must have been a nut with a bad mechanic, because the bolt for the case oil was totally missing and the oil is badly water fouled and dirty. I got a replacement bolt and have been trying to flush the old oil with new, crank it, pull it out, repeat. But I don’t think I’m doing this efficiently because the stuff coming out is nastyyy. It also doesn’t want to take a full 40ml like the guide here says- it’ll barely take 10 before it won’t take any more. Maybe just trapped air? Any thoughts on flushing this stuff out? I need something that can emulsify the water and oil so I can suck it out. I thought seafoam but since it’s for the crank/counterbalance I don’t know if that’s the best idea.The one you have is perfect. Just means Heavy Duty, basically marketing.