from 7 years of owning my w201 2.5D
i think the om602 is the best engine i owned and also the 2nd best engine ever after the good old om617
its not powerful but very reliable
my engine has +500 000Km and its never opened
the only problem i had is some lifter noise but i think this is common in all engines that use hydrolic lifters

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1991 190D 2.5 515K