My '84 300D has black leather, and it was in bad shape when I got it about a year ago. Shortly thereafter, I heard about Leatherique. I ordered a few of their products and rejuvenated my interior, and I don't regret it. MB-Tex has its advantages, but a supple leather interior is a far cry classier.
(Just an opinion. This post is not an endorsement of the fine line of Leatherique products...but it should be)
1995 E300 Diesel (Die Blau Frau)