car was starting ok but i noticed since couple of months that sometimes the ignition switch used to stuck and i had to return it to on position and that time i heard grinding noise from starter due to slipping of its teeth with flywheel (My mistake, I could ve used few puffs of WD40).About a month back when I turned the key there was a sound of rotating starter but no movement of engine. I took the car on flat bed to a garage and electrician told me that starter is electrically ok but teeth not engaging and it could be broken teeth on either starter or fly wheel. since flywheel is stronger than starter, so most likely it would be starter. Secondly when starter will be taken down, one can see the teeth of flywheel. Unfortunately, removal of starter is a bit difficult on this car, especially the upper bolt. My mechanic says that engine has to be removed and I am insisting that starter can be removed without talking the engine out.Today I took the car to another garage of moroccan mechanic who claims to have more experience of fixing Audis.