Date registered: May 2005
Vehicle: '07 GL320CDI
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It's only a minor point, but if there is any year to "stay away from" it would be the 2005, as that car will have had more time running pre-ULSD diesel fuel, meaning liklihood of EGR clogging is greater.
Inline 6 in '05 and '06, a 1999 design. Iron block, aluminum head.
V6 started everywhere in 2007, and is a much more modern design. All aluminum.
Both are indeed turbocharged, electronically controlled, variable vanes.
The V6 have diesel particulate filter and older versions don't (and stink).
The V6 is indeed only 3.0 l despite the E320 (and for 2010) E350 designations. They do, however, put out more hp and torque than the inline 6.
Urea only in ML, GL, and R-class, never in E-class through 2009.
The later cars are more likely to have phone, SAT radio equipment than the earlier ones.