When I first upgraded to ballscrews about 4 years ago I lubricated them and the fully supported round rails with chain bar oil for the simple reason I had a 5L can of it and no chainsaw any more (Oh, I do miss my chainsaw).

When we moved to Tasmania I didn't bring the bar oil and was told locally I should use a lithium based grease. So I got a spray can of it. Gooey white stuff.

After suffering a few stalls I took the machine apart and found the ballscrews and linear rails were all very tight, presumably glued up with the new grease. Liberal spraying with WD40 got everything moving again (I didn't take the ballnuts off the screws) but am now at a loss for the best lubrication to use. What does everyone else recommend?