White lithium grease (I think thats what its celled) comes in a spray can like wd40. Although it is funny that leatherman mentions WD-40 http://www.leatherman.com/products/tool-maintenance/default.asp
they say light machine oil (sewing machine oil if it still exists) but I like the spray white, its a bit thicker than oil so it doesn't run. Its the same kind of stuff you should spray on door hinges for cars.