They are, I agree, but if you're buying one that's 18 years old than you haven't done the maintenance yourself, and it's hard to be sure all the previous owners

They are, I agree, but if you're buying one that's 18 years old than you haven't done the maintenance yourself, and it's hard to be sure all the previous owners have done all the maintenance items. If I bought one brand new I have no doubt I could keep it running for 500,000km, but that's not the case in this hypothetical.