The factory lube, whilst good, does pick up crap - I tend to oil the chain after a couple of rides, but give it a good wipe to remove the sticky stuff on the outer plates.
Use a good quality chain oil - Finish Line, White Lightening etc, and just get the bottle droppers - put just a drop on each chain roller - that's all you need. No need to coat the links, as they will become coated anyway. Once you've let the oil sink in, give the chain a quick spin, then wipe it.
TBH if it stays dry, you'll not have to do much for a while, but oil after each wet ride.