Date registered: Mar 2006
Vehicle: 2006 E320 CDI, 2009 ML320 Bluetec, 2009 GL320 Bluetec
Location: Boise ID
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
How clean is your fuel?
The wear items are the nozzles, these can be replaced at far less than the cost of a whole injector. However MB in the US will not permit any of the dealerships to perform this function since they do not have the training or equipment.
The best advice, replace the fuel filter as specified every 26K using the best quality filters you can get (OEM, or MANN-Hummel).
Use good quality fuel that is rated at 400HFFR or lower for lubricity. Most US fuels don't meet this spec, so small amount of fuel additives may be needed to comply with this spec. In most cases 2%-5% Biodiesel will improve the lubricity of the worst fuels (520HFFR) and reduce it to the mid 300 range.
At 24,500psi any amount of dirt will act like a hydraulic cutting jet, it will slice thru any metal or in the case of a fuel system, erode the .117 micron nozzles holes (7 in total on each injector). Also high amount of dirt larger than 2 microns will oval the holes and destroy the spray pattern and ruin the characteristics of the fuel patterns...
Fuel filtering and fuel quality is the holy grail of injection system component life.