My car is in the MB shop today, they spent one hour but did not find anything, no fault codes.
They will try to do more testing tomorrow, I will let you know what they find.
How much time should it take to find what is the problem (if mechanic know what he is doing)

Thank you

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2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)