The SAITO manual that comes with the engine says to pre-oil the engine. It say's, ''Because the engine may have been sitting for an extended period of time prior to purchase, a few drops of light oil through the breather nipple into the crankcase and down the pushrods is reccomended prior to running the engine''. I agree with some. probably not necessary as long as you're using a fuel with enough lubricant. It says ''a few drops'', so, in reality, how much lubricating are you actually doing..