Hmm... I used 5W40 in an OM617, and it seemed to leak a bit. The next time I used 15W40, and it didn't leak.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles