Mercedes Benz introduced the OM612 codename, 2.7 L, inline 5 cylinder, dual overhead cam, 4 valve per cylinder, 20 valve, common rail turbo diesel engine in 1999 which stayed in production until 2006. The in question power plant was equipped in the W210 E-Class, W463 G-Class, W203 C-Class, W163 ML-Class, W209 CLK-Class and the W90x Sprinter with a power output of either 154 HP, 161 HP or 168 HP and 330 NM (243 lb-ft) or 370 NM (273 lb-ft) of torque.
The mentioned CDI unit is having a good reputation for being reliable however not everybody is familiar with the fact that it's requiring a special process from the maintenance perspective which is quintessential when it's coming of ensuring a long and trouble free life cycle. Replacing the sealings of the fuel injectors after every second oil change is mandatory on the OM612 vice versa it'll start leaking, leading to more expensive to fix issues and an unrefined and under powered operation of the engine. Be careful while removing the leak off pipe a.k.a. fuel return pipe because they're quite fragile, they are breaking easily if too much force is applied so be gentle.
Well maintained OM612 engines are able to last 500000 km (310685 miles) without a problem however finding a properly maintained one with a full service history is crucial. These 270 CDI units are not asking for much when it's coming to maintenance however if the the essential attention and care is given to them they can be one of those nearly forever lasting Mercedes Benz engines.
Source: Allaboutdieselz
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