In many cases due to how the supply chain is structured there aren’t any “quality” differences the wear and tear as you’ve mentioned is simply amortized in the

In many cases due to how the supply chain is structured there aren’t any “quality” differences the wear and tear as you’ve mentioned is simply amortized in the cost of the car. BMW is probably the biggest offender in this regard and you can buy the “unlock cables” for the older (<2015) models on EBay later they switched to a software lock, which you can also hack. https://www.ebay.co.uk/itm/BMW-E60-Sport-mode-unlock-cable-wire-pins-RED-LED-Button-16mm-5-series-wiring-/122562036544 https://www.ebay.co.uk/itm/BMW-E60-Sport-mode-unlock-cable-w... You can also tell there is no difference in the valves, pistons or pretty much anything else since the part numbers in the service manual are identical. The only difference in parts comes to the trim and the breaks on some of the models.