Despite the high cost, diesel engines are becoming increasingly popular due to the low price of diesel fuel, their sturdy design, their compatibility with maintenance and repair equipment for gasoline engines, and their ability to keep emissions within the prescribed limits. The opportunity for technicians to repair a diesel engine is becoming more and more frequent. Specialized technicians are very few, but they have great experience in repairing and adjusting these engines. However, there are also unskilled technicians, who fortunately are even fewer, and who, due to their lack of knowledge, create serious problems for the engines and cause great inconvenience and expenses for the customers. [...]
(from the prologue)