Wow. Since I've had the motor in my car, I've used only Mobil 1 15w-50 along with one bottle of Comp Cams break in lube. In 5 years, I've changed my oil once. Just checked it yesterday, and it's still pretty clear. On average, I'll drive about 600 miles/year. To be fair though, the first several years it wasn't really driven at all. 2012 was the first year I started driving it more than just back and forth from a shop/garage. And that was late 2012, so I'll say 2013 for all intents and purposes.