Because 1) car manufactuers have drilled this into our heads that if you don't get an oil change at 3000-5000 miles at 5001 miles your car will explode. 2) it's getting fricking expensive and time consuming changing my oil every 3000-5000 miles which occurs about once a month for me.

Figure I would change my oil with Amsoil at 20,000 miles and I drive about 1000-2000 miles a month. I'll be changing my oil 10 times this year at the cost of $20-25 a pop. That's $200-250 a year in oil and filters.

Now I maybe change it once a year. But don't get me wrong this is not the bible and you guys should use your better judgement. All I have to do is take a few ounces out and send it to get tested.

And yes I love my car and for those who know me I autocross every other weekend