Frankly...your model seems to have some problem. The 'shape' of the car was weird and.....can you provide blueprints that you used and show a wireframe image? As other people said too, your materials need to be changed. I've circled a few problems, some are mesh problem, some are materials, and can I ask you, why the seat is 'refracted' in such way too? I didn't see any car in real life that the seat was refracted like that and all the 'interior' of the car seems to be in water, maybe because of your 'tint' of blue colour and the refraction.
Thats all the 'problems' that I can see at the moment. Thanks and sorry for the long post. I hope this post won't be 'offensive' for you, those are just my opinions and 'problems' that I spotted.