With tuning, the increase of the engine power is achieved by optimizing the engine and by staying within the tolerances of different componnents of the engine, while at the same time not exceeding the limits of engine operation. According to previous experiences, the range of diesel engine efficiency can go up to 60% of the initial value. For normal use of the vehicle, regular oil changes and regular service, engine life is not reduced. Only if you drive in constant 'sports' style, you will have to change car oil more frequently than recommended by your vehicle manufactures recommendations.