Thought I'd post this as a "before and after tune", since some folks may find it helpful. Here is the first UOA before my stage 1 tune: https://www.bobistheoilguy.com/foru...
Here the UOA with 5K on it, same oil and same driving patterns:
A couple of thoughts:
-I'd disregard oxidation comments (and TBN). Starting oxidation on this oil is ~26, so I don't think this is anything to worry about (wasn't flagged at all on the previous UOA?).
-TBN is pretty high considering the low starting number
-wear metals are again ridiculously low
-Si from the first UOA was, I'm almost certain, due to dirt on the extraction device. I was more careful this time
-viscosity is down, due to the fuel. I suspected this would happen based on UOA's I've seen of past APR tunes
Overall, while I think the oil could go longer, I'm not sure I'd push it to the 10K factory interval with that much fuel in the oil? I'll probably run it out to 7.5K next time and see how it's doing--or I may just stick to 5K (which is APR's recommendation).