I am damn glad I did grease up my sleds found a broken bolt on my doo doo! The cat stills look nice and in good shape! But the doo I am glad I found this bolt broken now! I dont know what it is called but it looks to me like I could lose the sliders and the track if it fell out!
mobile 1 or slick 50 grease is what I use. I think the more you grease your sled, the better chances you'll have of displacing that water build up. I think that's just as important as the lubrication itself. Rust is the enemy. I dunno
any quality EP waterproof grease should be good. (EP= extreme pressure) greasing is good, and cheap insurance, and you just may find a loose bolt etc... thats easier to fix in the garage than on the trail (or maybe worse if more damage is done by bolt falling out or something like that.) When you grease it you very often see the water forced out of the joint by the grease. (unless its in a heated garage and evaporates)