Let's see, I've got about 4,500 mi on my oil change that I did last month. I've been using mobil1 0w40, but I'm wondering is there a super tech synthetic that I could use seeing as how this engine is so easy on oil. I see super tech 5W-40 and now 0w-40, wouldn't be opposed to using a 0w30 or 5w30. So many choices these days. If I can save 5 to 10 dollars per oil change I might switch to super tech, as long as it's good enough for my engine doing 5K mile oil changes. Any suggestions?