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Not everyone is going to send their little oil sample to some lab for a TBN oil analysis. I certainly not. lol The aim is to generally change it every 5.5k,6k, 6.5, 7.5k, 8k, blah to be within the standard of every engine run. You cannot tell me that your last engine run of 10K mile with a good TBN will be the same for the next. After all, it is your money and way of doing things so be it.
If sniffing your oil works for you, who am I to argue. Just don't be sniffing your differential oil. That stuff stinks right out of the bottle. Based on smell, you'd be changing that daily.
This seems like such an endless debate/ argument. I am moving on to happy trails with my 5K per change. Not like it's a really hard thing to do.
Ding,Ding, Ding!!!! We have a winner folks!! You cant go wrong with 5k intervals. Especially on Synthetic. Just wait till the good ole "Maintenance required light starts a flashin"