A good friend of mine has a 96 Mustang GT with an aftermarket Vortech supercharger on it and he doesn't drive the car all that much, it's a weekend summer car only. As a result, he has only driven it about 1000 miles since his last oil change, which was more than a year ago now! I keep bugging him to change the oil (it's Mobil 1) but I wanted to know if there really would be anything wrong with his oil? He never starts the car unless he's going to drive it (I told him that if he started and idled the engine it would just put moisture into the oil that would not burn off since the oil wouldn't get above 200F unless the engine was under load) Also, whenever he does drive the car he takes longer trips with it, driving it a half hour or more typically. So if his oil were analyzed at this point, what would it show? Would it still be suitable for continued use?