[pja]

For some reason people in the US are obsessed with changing the oil in their vehicle.

Modern engines & oils don't need the oil changing every 3000 miles, but the folklore belief in the necessity of doing so rolls on unstoppably in the USA.

[city41]

A factor is oil change shops still put a sticker on the windshield that says to come back in 3000 miles. It's of course in their interest for people to change their oil too often.

[hef19898]

I have both, two modern cars with services all 30k km and one from the 80s with motor oil changes every 5k, gearbox oil every 10k and axles every 10k as well. Not to mention that modern gearboxes and exles tend to be greased for life.