Someone asked the question so I answered based on my own personal experience with turbo engines and research over the years, including some oil analysis done on my own vehicles. I am by no means an engineer. I offered my opinion. I try to do 5k oil changes regardless of mm. (edit) If your mm is 0% before 5k then yeah absolutely change it. There is clearly logic in the MM with regards to temp, operating conditions, etc so If you are at zero after 1000 miles, that's one thing. But I think 5k is quite reasonable for a high performance direct injected turbocharged engine that runs 20psi and on 87 octane fuel and severe conditions.
My wife's CRV with the 1.5 engine is still a diluter, even after the TSB. The level visibly rises on her dipstick over time. My 1.5 EXT was a diluter, but to a lesser extent. Such is the nature of most TGDI engines. I have not heard of many engine failures due to dilution, but I would rather be safe than sorry. The CRV has over 50k miles in 2 years. Hoping for another 100k.
I note that you're basing your oil change intervals on feelings rather than on data. Which is fine for you and your vehicle. Your assertion (stronger than an opinion, BTW, despite your protestation to the contrary) that if you want engine longevity you should never let the MM get below 15% is pure garbage however, with nothing scientific to back it up. Whether or not other readers follow your recommendation is up to them, but you have presented no real data to convince anyone that they should.
You used the figure of 15% as the threshold. Why not 20% or 10%? How did you come to the conclusion that 15% was the proper figure?