During the life of a diesel engine, internal components become worn and start to fail causing excessive blow-by, loss of power and compression, oil consumption and overall tired and inefficient operation. This de-evolution and degradation of performance is inevitable and will eventually require the engine be stripped down and reassembled with new components. It is better to be preemptive and do this with anticipation and planning as opposed to putting it off and finding yourself broken down on the highway with a load.