BMW Oil Service - +0.9L and dirt/dust build up

[Pip1968]

Just a quick one to say that after having had an oil service undertaken by BMW they were a little perturbed to find the electronic measure showing +0.9L. They double checked by means of the dipstick which shows full as per the service and I think they wanted to replace the electronic oil sensor. I told them it would be fine as is and am sure it will settle a bit more after a longer journey (they did go through the reset procedure and take her for a quick run but to no avail).

At the end of the day it is 0.1 out and assume this is acceptable - it is electronic after all. Has anyone else found this? I did read the oil service sticky which seems to lean towards what was found here (pages 2/3)

Also once they removed the airbox they said they found lots of dirt and dust which they thought may enter the throttle bodies if not removed. They quoted 2 hours labour but I said I would sort it myself. Is this build up of dust and dirt here normal? Should I have got BMW to sort it? I assume it is a fairly straight forward task to complete the cleaning.

Any comments appreciated.

Pip