Modern diesel engines use sophisticated fuel injection systems to provide efficient engine operation and performance. There is a clear relationship between injector fouling and general fuel system cleanliness to loss of performance and fuel economy in both indirect and direct injection diesel engines. The latest electronically controlled Common Rail Direct Injection (CRDI) have smaller nozzle orifices and tighter internal clearances which require extreme cleanliness for proper operation.
The quality of the diesel fuel is the major contributor to injector fouling and subsequent loss of power, performance and fuel economy. That said, even “high” quality diesel fuel contributes to injector deposits just at a slower rate. The major diesel engine manufacturers (OEMs) have issued statements through the Engine Manufacturers Association (EMA) recommending the use of “Premium” diesel fuels. These “Premium” diesel fuels incorporate a fuel system detergent, and increased cetane through the use of a multifunctional diesel fuel additive.