Having torn down and rebuilt several motorcycle and automobile engines over the decades, I’d think I’m quite qualified to spot and recommend a reliable mechanic. BTW, these shops use genuine parts and neither of these shops use dyno oil, in fact most shops in cm recommended synthetic. Official service centers aren’t always the best, I take my wife’s Honda City to the best Honda specialist car mechanic in cm and it’s not at a service center, same goes for my Toyota except a different shop. Though I understand your disposition of stigmatization.