Dear Adnan, Alhamdullilah so far i have felt no reason to go to any mechanic. However, following things were done by Toyota Rawal Motors Rwp:
1. CNG Installation.
2. Change of lubricants (atf, break fluid, power steering fluid).
For normal engine oil/filter change I go to any roadside mechanic, there is no problem in it.
I visited twice a mechanic near commercial market Rwp only for minor gas adjustment. Other than this I have never gone to any mechanic for anything [Alhamdulillah].
As I posted in my prevoius post that my ride was rear-ended and bumper and mud-guard have been damaged. For denting painting I'm planning to go to Auto Club in I-10 Islamabad.
My suggestion is to check your car from Auto Club, they are good. Mr. Mazhar is owner of Auto Club you may contact him.
A lot of people have been complaining of vibration. If CNGed vitz' are facing vibration problem then it is most probably due to bad quality CNG, as in winter season gas pressure is not enough so CNG Station people mix air in CNG and this is causing problem. Couple of weeks ago I filled CNG from Gujarkhan and it turned out to be nightmare. my vitz kept on vibrating until that gas was consumed.