I have a Mercedes A160 for the last 5 years. Its been a great car and with regular servicing been 100% reliable so far. Now I am getting suspicious that something may be going wrong but maybe I am just nervous. The car seems to be revving a lot more on lower mileage than it used to do. Even at driving at 30 its revving up to 2 which it only used to do at higher speeds, is that normal or should I find a mechanic to look at it? Just feel its struggling so much more than it used too. Would rather prevent a breakdown with winter coming as the car is the only way of getting out of the house. Any sensible advice appreciated please.