I have 34,500 on the car. I'm beginning to think there's no reason for me to push any oil to its limits. Why risk it? I didn't change to synthetic so I could extend my oil change interval. I changed because I just want what's best for my car. I want this engine to last! I plan on keeping this car for a long freaking time. And I shouldn't base my OCI on the UOA's I've read because, uh, they're not my UOA's! I don't know how these people drive, and there's all kinds of other factors too.
On the other hand though, I rarely ever go over 5,000 RPM and I don't have any engine mods... yet. This has been my reasoning for a 7,000 mile OCI. Is this reasonable? Hmm...
I'm thinking about doing my first UOA at 5k anyway so I'll know my ideal OCI and also to see if there's any problems at all. I figure it's like an annual blood test for my car. After reading a bunch of UOA's from bobistheoilguy.com, I wonder if anyone's ever gotten a report back saying, "Oh dear god, sir, we've never seen such horrific numbers with your oil. Your TBN is negative! Change immediately! Better yet, sell your car while you can, before it blows up!" - yours truly, Dyson