Why is _no one allowed_ to install my washbasins?

Just another way of asking:
Can you buy brake discs and calipers on the internet, bring them to the authorized workshop, and only pay the labor cost for the installation?

Yes! Many workshops order spare parts at a price you can also get on the internet. And they charge their labor costs separately - reliable and transparent.

Yes! Many workshops order spare parts at a price you can also get on the internet. And they charge their labor costs separately - honest and transparent.

I also always bring my own oil to the customer service myself

So yes, it actually works, that's why it wouldn't be so far-fetched in the plumbing sector either... If only that mafia didn't exist there.

At my BMW authorized workshop, that is not possible.

at my BMW authorized workshop, that’s not possible.

Well, if you go there, the price is secondary for you; I don’t complain about the lobster price at Karstadt delicatessen either.

At my Mercedes workshop, they do - you should switch to a decent brand

but at my Mercedes workshop they do - you should switch to a decent brand

you can really bring your spare parts that you ordered from the internet there? ops:
This is not about oil or windshield washer fluid...
We are also not talking about independent workshops.