Here's one that didn't occur to me in that other thread... Did you replace the timing belt at 90k miles? If not, do it NOW. When it breaks, it'll bend some valves when they get hit by the pistons. My '95 owner's manual says INSPECT the belt every 30k, but there's no replacement interval. Honda's since changed their tune. I guess if the belt has cracks large enough to see, you've got at least a few hours before it breaks.

Then go over the maintenance schedule in the owner's manual. See if you can find what you & your cousin missed over the years...