Friend back in college bought a new 7th gen Civic si (or whatever generation a 2003-2004 would be) and when the engine gave out on her at 40-something thousand miles, she thinks she maybe had the dealer change the oil once, but can't remember. She never checked the level or had anyone else do any maintenance on the car.
That car was stolen while sitting in her apartment parking lot, since she couldn't afford a new engine.
I was thoroughly impressed with how long that darned thing went before giving up the ghost. When I visited her a couple of times a year back in college, I never thought anything was amiss when I drove with her in it (probably 20-30-something thousand the last time I drove with her, IIRC,) though I admittedly didn't know anything about cars back then.
I never got the details before it was stolen, but I've always wondered if the thing would have gone longer if she topped off the oil when it was low (i.e., did it seize because it was all gummed up or did it seize because the oil level lowered to below some critical point where it rapidly caused failure?)