Hyundai Motor India — Carbon emission

Address:

Vellore

I bought a verna 1.6sx on 2014 march registered in the name of k.v.Suresh(father) all these years have done company service and maintenance.past two years carbon emission is more and pickup is drop.but emission test shows normal report, oil level is not reducing.feeling awkward to drive in highways…as of now its been nearly 90k kms.we have tried in showroom service centre many times same problem they checked and did nothing…i kindly request you to resolve this issue as soon as possible