I've been using Mobil 1 since 1982 and my Subaru WRX 2008 has had it from when I bought it in September of 2007. The WRX has now 104800 miles and I use this car to commute about 110 miles a day. I've use regular Mobil 1(5w-30), and have recently switched to Mobil 1 5w-30 (extended performance). The oil consumption very conservativly, is not more than 1 quart in 6k miles. I'm going to have the timing belt job done very soon and hope to be still driving this car for at least a couple more years! This car has had only one major componet failure, the radiator @ about 78K.