how often change your engine oil?
Although new vehicles can run longer on the same oil than older ones can, and improvements in motor oil have extended its efficiency over longer periods of time, to be on the safe side, you might want to change your oil every 5,000 miles or every six months, whichever comes first.irty oil just doesn't do the job as well as fresh oil does. The additives in dirty oil boil out, contaminants form in the crankcase and eat metal parts, and water collects over time and forms sludge.