Many car waranters require an oil change every six months, regardless of mileage. I believe that is because the oil additives break down, as said in one of the above posts. Maybe that's why auto shops clear oil at cheap prices when it has been sitting on the shelf for a while. I don't think you are facing any kind of a 'dilemma'. Even so, a quick oil and filter change is no great difficulty, so why not do it? The only question is whether you've got the $50 or so it takes to do it.