Somehow I have to think the whole gotta use sythetic is a bit of overkill.
Derek has been changing his oil at a frequency much greater than the manual demands. Thats got to be a good thing. The cheapest sythetic you can find in Tucson is usually the Mobil one 10w40 or 20W 50 and it can be found at Walmart on a good day for 7.99 a quart. $3.50 a quart is a good savings especially if you are gonna drain it and replace it every 3 to 4 K. Derek racks up some miles so he dont wanna go broke buying oil.
Perhaps I should try that. I have changed my oil now three times in less than six thousand miles. Once at 500 again at around 1500 and then at 4300 all with either Mobil one full sythetic or Mobil one syn.
I coulda bought a few cheeseburgers with the savings.