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My '13 sedan has the LSD (option 471) and I have read that it is supposed to have cooling fins on the differential case. Mine has a flat cover in back and some support ribs and it looks like cast iron but no fins that I can see. Bear in mind that I was looking at it while laying on my garage floor so I couldn't see the whole unit. Does anyone have photos of the unit or know if it indeed has cooling fins?
Thanks to one and all for the insightful info on this topic. I too am curious as to why some would come with the finned back cover and others would not, especially if they are equipped the same (p31/LSD, etc.). I read where during a magazine (don't recall which one) test of the C63 it "spilled its diff fluid on the track" after several laps so it would seem that the fins would really help. Wonder what it would cost to purchase them.
I have a 2010 sedan and no fins on mine either. All the others ones ive seen here in the bay area dont have fins on them either. What i have noticed E class and above (e, cls, s, sl) do have fins.
I did talk to dealer about installing them as i could on my quaife diff, the only problem is they hang even lower than the whole exhaust system, and with my car being dropped, i dont want to risk having my fins break by scraping someting.