I've been running Mobil 1 0-40W in my OM602 and OM606 engines for the last couple of hundred thousand miles - with no head work, no replaced lifters and ZERO lifter noise.

Go figure.

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98 Dodge-Cummins pickup (137K)
13 GLK250 (157k)
06 E320CDI (341K)
16 C300 (89K)
82 300GD Gelaendewagen (54K)