The mobile fleet in the United States ages at an alarming rate, already reaching an average of 14 years of age. At nine years old and exceeding 150,000 kilometers, it is considered that a vehicle is old and that the repairs that it requires for its correct operation will be unprofitable. However, our cars continue to turn out to be years old and are becoming more polluting and inefficient. The future is not anything to look forward to: it seems that by 2018, the average age of vehicles in the United States will be 15 years. Over the years, the dangers increase and the risk of mortality in the event of an accident increases. Some manufacturers assure that the distribution belts of their engines do not need any repairs, as they are designed to withstand over the life of the vehicle, which they estimate to be about 210,000 kilometers. Nine years: the life of a car If the car has not exceeded three years and is below 40,000 kilometers, it is still considered new. During this period, ...