JD, there's a current thread on the forum about a problem a member had with a Fram filter. Not a Wix but not an OE filter either.
In the absence of facts, the common feeling around here is that an MB engine is not worth the risk of an untested filter. Mann, Hengst, Mahle and Knecht filters are all known to keep MB engines happy. I couldn't tell you what's in any of my MBs at this moment but I know it's one of those brands.
83 300SD ... $950, see cars forum