Over years of working in a mechanic shop and shopping Craigslist, I’ve noticed here and there that people will claim that their old car is still equipped with its original factory-installed fuel pump or fan belt or water pump or whatever, despite the vehicle’s high mileage. “Pulled the brakes apart today. The car is still using the original brake rotors.”
Usually this is 3 or 4 owners in.
Unless they have access to every service record from day one, and know that they aren’t missing any, how do they know that it’s an original part? Do they just see dealer-installed OEM parts and assume they’re the original ones? Kinda confused here. Maybe I’m missing something obvious.
Sometimes you can see the pen marks made by the factory on things like brake rotors and the accompanying set screw. Once the set screw is undone, the pen marks no longer line exactly up, or the replaced part no longer has pen marks on it while the set screw does.