Brussels - good indy garage w/parts by the client

Greetings,

Every time I need some maintenance done (e.g. an oil change) on my car I have to negotiate with garages to agree to use my parts. Now, I understand that they want to avoid problems and make some of the profit on the basis of their parts mark-up, but it's too much of a hassle. I have no problem to pay something extra for labour, but I'd rather source my own supplies, first because I can get them cheaper, and more importantly, because I do care what gets put in my car.

So, could anyone recommend a good independent garage which is OK with using parts/supplies provided by the customer? Preferably in Etterbeek radius. Thanks.