I put over 100k on a D16 without changing the oil. No, seriously. My car actually changed it's oil pretty much all by itself. Well, it did half the job at least. It slowly blew it out the back, and then my oil light would come on, reminding me to dump in another quart. I blew it up around 160-170k. I just called japan and they sent me a new D16 right to my front door. For $580, I can't complain. I prefer to look at what I did as a "test" of the durability of Honda motors. Honda gets an A+ in my book.