Good for you, and I hope your good fortune continues.
I just have a problem (personal one, I admit) with these transmission designs that are actually engineered to make metal shavings via normal operational charecteristics. If I had an engine or transmission that I knew was doing something whereby the lubricant contained therein was becoming contaminated to design excess, then I would be changing the lubricant excessively.
I have 2 vehicles that have GDI fuel systems. The recommended OCIs for both is 10k or 1 year. I am changing each of them at 5k intervals because I know that GDI engines have more oil dilution charecteristics from the GDI operation inherently.