You should consider changing the oil out between covered changes too if you drive 10,000 to 15,000 miles a year since the free change intervals are way too long.
I see you're in LA/OC. Join the BWMCCA and most dealerships give discounts are parts. Crevier is pretty good, while Nick Alexander use to give a very good discount. Not sure how much they give now since it's been a few years since I've been there.
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."