Bhai, No offense, you own a million rupee car and afraid of taking it to a authorized dealer, saying that they would rip you off... yaar authorized dealers would always charge more but at least they won't do no "Jugaar" .. not to mention that with EFI cars Jugaar is a killer..
Always play safe with your car and take it to Authorized dealer if you have any problem... if some local guy messes up one thing, it would lead to a big mess for sure...