hello, 4 months ago I bought an omega mv6 used. so gradually more and more small defects come to day. under another the km counter just stopped 6 weeks ago. they told me that there was a gear broken, because I put the day counter on 0 during the ride. the day before yesterday he suddenly went again. now I thought that this has occurred already and the vehicle has a lot more km on it than indicated. where can you have such a check? what cost? T such an opinion?