I had a Maruti in Kolkata and found the service centres will do a good job only if you know them personally. Our driver had friends among the meachanics and my car used to get a royal treatment there Sorry to say this but, Once I was stunned to find 7-8 sealed can of engine oil below my seat !!!! Asking my driver I came to know that the meachnics there sneaked those cans by using my car and to collect later outside !!!!! This things may be prevalent elsewhere, but just shared my experience. Just imagine how many unsuspecting customers are running with the old engine oil !!