Excuse me,
I have a W211 E320 cdi with 108k miles on the om642 V6 diesel engine. Up until a couple of years ago, it was serviced regularly using genuine parts, even by the main dealer.
I've got a problem where when it's left for a couple of days unused it'll take a bit longer to start, it always does start but it's like when you change the fuel filter and theres air in the lines, once it does start it runs perfect and will start again that day and even the next no problem at all, its only when it's 2+ days.
There isn't a glow plug light or engine management light on, and it's hot here right now (more than 30 degrees Celsius), so I doubt they're needed.
Using my rudimentary OBD reader, I have tracked the fuel rail pressure: with ignition on number 2, it ranges from 6.5 bar to 8.7 bar, and when the engine is started, it stays around 300 bar and climbs as the throttle is applied. Bosch made the battery, which is relatively new.
I've checked under the hood and didn't find any major leaks; however, I did notice a tiny mist of oil (or maybe fuel?) on the fuel hoses connecting the high-pressure pump to the fuel filter; however, the mist is so tiny that I am unable to determine its source or whether it would have any impact.
Can you think of anything?