Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Southeast Michigan
Mentioned: 2 Post(s)
Quoted: 141 Post(s)
No help on the head work, but a couple of thoughts to consider.
My understanding is that the head gaskets on the 320 are robust and usually are not a factor.
Is the engine running a normal temp (87C)?
On the other hand the radiator can deteriorate and leak transmission fluid internally. Usually that will translate to trans problems. Does your trans shift normally? You can sample the trans fluid to see if contamination is occurring.
Does the reservoir level change? How about engine oil level?
Can you pressure test the cooling system?
Perhaps a drain and refill might be a useful first step. Cheap and simple DIY.
Tell us a little history on the vehicle. Miles, maintenance, etc.
'07 E320 BlueTec