Regarding the change the oil at 100 - there was an engineer on this site years ago (pelotonracer2) that posted Break-in 101, a four-stage process that he claimed would increase engine life, etc. Part of the first stage was the oil change at 100; according to him it was the best break-in tip he could offer. Again, according to him 70% or more of the new car break-in is achieved during the first 100 miles; ergo, more minuscule metal particles floating around the engine at the time (and the oil filter can only catch so much). If you can review his 101, do so - it still might be somewhere on this site. Expertise - he claimed to have torn down numerous engines for testing and had hand-built engines for racing. When I bought my little beast new back in late 2014, I followed his four- stage 101 almost to a "T" as my little monster is only primarily a weekend driver. I've got over 18k miles on her now with absolutely no problems. Does following 101 work? I don't know - maybe time will tell, but for me it certainly hasn't hurt. When I changed the oil (and filter) at 98 miles, I did notice quite a few particles in the drained oil. BTW, he also recommends changing the oil & filter after 500-600 miles as well (which I did).