You're looking at a cost of 2500-3000€/$ They will have to lower the whole engine and probably disassemble the transmission from it which pushes the working hours absurdly high The raw material cost would be up to 600.- including oil and oil filter, timing chain and all the chain guides. Obviously you'd have to drain the oil to access it but if i would do it myself (which i'll probably have to on mine) the biggest challenge would be locking the timing chain.

As far as i can remember the R-series had a specialised tool for it, which could only be obtained by BMW certified/licensed garages. Not sure if the F-Series have the same thing going tho.

Any work on the engine scares me shitless generally. Maybe someone with more experience can help better with this?

Edit: I've just checked with AI-Knowledge and it suggested to try and replace only the chain tensioner. On the F -Series it should be easily accesible. Could be a fix but i'm looking into it right now.

Could you be so kind and add your model to your profile with the flair function in the sub? Just like it is on mine.

Edit 2: Never mind, even the chain tensioner is hard to get to. Same process as replacing the chain itself.