What happens to the oil after three months if you haven't driven the 3,000 miles? My little window sticker shows that another oil change is do after 3 months or 3,000 miles. Do you really have to get it changed? I checked the engine oil and it is darker than when it was filled in May, but the level is still full and I have been out sick a lot with bronchitis and haven't driven even 2000 miles in the last three months and would like to save the $26 for another month or so, but not at the expense of a new engine. Any advice or ideas?