I've got a 99 nissan altima with 120k on it. I currently am using mobil 1 extended performance fully synthetic 5w-30 oil in it. It says on the bottle that the oil has a life of 15,000 miles and that this is a safe interval provided that you do not drive numerous shoft trips where the oil doesn't get hot. I usually change it at 10,000 just for peace of mind. The oil always comes out it decent condition so I've been keeping this interval.
I am a college student that doesn't have time to work many hours during the week and I can't have a job where the schedule is changing all the time, so I might be taking a job delivering newspapers because it fits my schedule perfectly. I'd be using my own car to deliver them. I'd be doing it really early in the morning so there wouldn't be many if any other cars out, so I wouldn't have to do any stopping. I could drive at 10 mph and just throw the papers out the window. Now here's the meat of this long winded question: Should I modifly my oil change interval?
I know that if the car meets the conditions defined in the manual for severe service then yes, but mine situation is kind of hazy. I;d be driving 20 mins to get to the location where I would start to deliver, then I would be coasting around for probably 2 hours or so (I'm only going to be delivering one morning per week) I was going to just coast in 1st gear to keep the revs up so the engine is above idle for better oil pressure. I would think the oil would stay plently hot doing this, and I wouldn't be changing speeds alot. The fact that I'm using synthetic oil makes me feel better, but I thought I'd ask for sure.
Also, what are your opinions on the mobil one extended performance oil?