Which is the best Mercedes E-Class diesel engine?

The W213's 220 d, with the 2.0-litre OM654, combines low consumption with good reliability. For more pull, the 350 d or 350 BlueTEC V6 is smooth but costlier to run.

What problems does the Mercedes E-Class 250 CDI have?

Early W212 cars with the OM651 engine had faulty injectors that Mercedes replaced under a recall. Check the work was done and that the timing chain is quiet from cold.

Does a diesel Mercedes E-Class need AdBlue?

Yes, BlueTEC models and the W213 d versions use AdBlue to cut nitrogen oxides. The tank is filled separately, and a fault in the system stops the engine restarting once the warning runs out.

Cars

Used diesel Mercedes E-Class cars

Found 1,125 cars

From €1,000 to €73,990, half under €19,900 · Typically 2014 with 192,000 km. Diesel suits a high-mileage E-Class. The W212 brought the four-cylinder OM651 and the OM642 V6; the W213 introduced the cleaner OM654 with AdBlue. Short urban trips are hard on the particulate filter of any of them.