One of the most overlooked preventive maintenance items in a diesel engine is the coolant system. Maintaining the coolant system is just as important as an oil change - in fact, the coolant condition in a diesel engine may even be more important than in a gasoline engine.
The increased use of EGR valves has led to a bigger problem with soot. So, in order to trap the soot, the government has mandated that all trucks built after Jan. 1, 2007, have a diesel particulate filter (DPF) and a catalytic converter. In simple terms, the DPF is a...
