Date registered: Mar 2013
Vehicle: 2009 C220cdi sport estate with no options
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Blue efficiency is the marketing speak for EU5 onwards engines.
Before that there were not badged blue efficiency. I have the OM646 single turbo non BE engine and its a June registered 2009 car.
The OM651 is the new BE engine and it has two turbos, a different timing system (can be unreliable and the chain is at the back of the engine and a lot of its gear driving so if there is any lubrication issues later down the line the engine will go bang) and the injectors on the OM6510 early on gave a lot of issues.
Always avoid the first batch of anything new and go for nearer end of line stuff thats had bugs etc ironed out
Current Merc: 2009 C220cdi sport estate
Prev Merc: 2005 E320cdi sport