The idea is that the whole car made the distance.
Some repairs must be taken in context. My 84 Civic at 400K failed California smog because of just the oil rings that caused visible smoke. I took one shot at the valve seals but no luck. I overhauled the engine for the first time and it was a real shame. Everything looked good but I did the whole engine because I had it apart. Things I did not replace where the crank, rods, camshaft, valves, springs and rocker arms. I replaced the pistons so that I could use better rings, honed the cylinders and put everything back together with a new water pump and timing belt. I use Red Line 0w-30 oil which is great for a daily driver and has served me well in the past.
I can still say I have a 440K car because the rest of the car is doing great. Everything works, it's never been dinged or re-painted, no rust and it drives like new. The miles are coming on a lot slower now but I'll probably hit 500K before I die. I have other cars but still drive the Civic and still enjoy it. When I die I'd like to be put in the back and have a Viking funeral.