Cars in the Audi segment demand a much more maintenance as compared to cars in lower segment. The best what you could do is get a full service warranty by paying some extra amount and get your car in free service warranty for 3 to 5 years.
Audi doesn't offer it as an optional feature, however you can try to get it by authorized Audi dealership, there are also a few aftermarket options available. Cost of the job will be around Rs. 20,000.
Audi doesn't provide these details for the Q3, however the legroom and headroom in the SUV are adequate only. The legroom and headroom are fine at front seats, but at rear bench the tall passengers (around 6ft and more) will face problems due to limited legroom and at the same time the sloping roofline makes the headroom another issue.
You can see the legroom and headroom at front and rear in below given images
In the picture you can see that when the front seat has been pushed behind maximum, the legroom at rear will be quite lesser and the sloaping roofline almost touches the headrest.
The maintenance cost of Audi Q3 mostly depends upon the condition of the engine and other spare parts. If the SUV is properly cared with regularly service checkups, the minimum annual maintenance cost for the first year is around Rs 13,000 while for the second years its around Rs 16,000