I just use Delo 400 or Rotella 15W40. Sometimes the Delvac 1300. Synthetic oils scare me; I have pictures of all kinds of gaskets starting to leak, and general disaster since its been run on dino for life. Every 3000 with a fresh filter, for me.

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http://www.betten.mercedescenter.com...n_banner_1.jpg
1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat