We can’t get parts for my wife’s 7 year old Buick convertible anymore so that’s not really true. We took it to the dealer to get a service done and they broke her fob then messed around for two weeks before declaring that they couldn’t source a replacement. So it depends greatly on the vehicle. If it isn’t an American truck then good luck getting documentation or parts for it. Luckily our regular mechanic actually knows what he’s doing so he’s able to come up with alternatives for things like turbo solenoids. But the OEM parts are always on backorder and are 10x as expensive.