15K mile protection... comments? http://www.mobil1.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance.aspx
Still would change my oil every 5000 miles with that, it is good up to 15000, but that is just for lazy people who don't maintain there car. You go to sell your car and the person sees that you change your oil every 15000 miles and watch how quickly they magically disappear.
You can really run oil for that long, I'm pretty sure the oil companies have to guarantee their oil wont break down for either 7K or 10K miles, I forget. I wouldnt recommend it but as long as your oil isnt too dirty you could try it.
I run Mobil 1 5-30 and change it around 5k. It is probably good for longer but that is getting close to my 'paranoid' zone. In the back of my mind I keep thinking 'man this stuff isn't any thicker than water..'...
Maybe it is too thin.. could be why my car seems louder than other WRX's. But then it uses none and the power seems fine. I started using it at 3k and now have 57k. JWX and I discussed this and he's 'you are killing it'. Okay.. I'm the guinea pig. I'll let ya know when it explodes.
Since I like to change the oil at least every 5,000 miles, I like using the GTX synthetic blend. In addition, I have been using a wrx oil filter on my sti....maybe someone has compared the wrx filter with the "special" sti filter...have not had any problems...thanks