Amaze.. good outer looks but very disappointing performance and interiors. Interiors are like one that of a low cost saloon car. (My ZEN has better interiors than this car).
My Amaze is just a month old and have run only 300 K.Ms and it makes hell lot of noise which is very much audible inside the cabin as if you are driving a heavy engine truck. You can feel it when you go for a test drive, see how old is the car (ODO meter) and how much sound it produce.
It has also started giving diesel engine lags. I wonder how much sound and lags it would produce when this diesel engine would be an year old.
My friend got a chevy sail which I found a much better option, with airbags in every model(not like ABS in every Amaze model). Airbags protect you not ABS. LOL!
And Maruti Suzuki dezire is also much better option.
The engine noise is coming in the cabin because of poor cabin insulation and it depends on various things like gaps between panels and doors, material quality, etc. You need to get major changes in the interior for better insulation and we won't recommend that.
You should go for the fourth servicing despite the fact that you have not driven your car much. It is important that you go for regular servicing. Whether you want to go for wheel balancing should depend on if your car is bobbing while driving or it is not going in straight line.
The choice of the variant between diesel and petrol would depend on what would be your monthly run. If your monthly run is more than 1500 kms, you should go for the diesel variant else you should go for the petrol variant.