Vento - I feel it

I have purchased my car few months before. I have made lot of search on internet, took lots of test drives, online comparisons, customer reviews and practical feedback from true users. As I was looking for economical & comfortable sedan for my parents, I have looked for comfort, easy & effortless driving, safety, intact built in quality, good & painless service & most important is fuel efficient both in city as well as highway, so that they should not think about taking it out anywhere. After a quantum of survey, I have decided to go for Vento comfortline diesel and after these many days I feel like I made a bingoooo.. My parents found it all they need & there is no complained from them as of now; good fuel economy, Easy & comfortable driving, better control, obviously German brand well built in quality (as explained by company executive, galvanised body even with joints and all) Spacious & good safety features With all that I am pretty happy with my decision. But with all that good, I am finding that the engine sound is increasing as the days are passing. I got it checked on service centre but nothing improved much & I don't know why. But with this many good and some pranks, I will refer my choice to other and once again thanks to Volkswagen for providing all good to us.