Keeping your engine clean helps you in the long run. It enables you to restore the engine parts rather than replacing them. It helps you save some bucks as engine parts replacement can be costly i.e. a new turbocharger costs around $ 1.350 – 3.100, the catalytic converter is b/w $ 600 – 2.000, DPF ($ 600 – 2.000) and EGR valve ($ 370 – 500), etc.