Danger Will Robinson - - sorry - I'm old - while the oil may not go bad the stuff added to the oil decays over time - there are detergents and other "stuff" added to those dead dinos that help keep your engine alive - I'd change the oil and the filter - that's why they recommend both mileage (like "every 3000 miles) and time (like "every six months") -This is the dumbest (sorry) question I have EVER heard! Oil never goes bad. Its been sitting undergound for over 2000 years for goodness sake! It would only go bad after a LONG LONG time! By that I mean sitting in the engine for 30 years.