For what it's worth, Laso and Graf are two brands that I have heard and read are best. There may be other good brands, but I'm not aware of them. Of course, Genuine Mercedes will be very good, and may very well be one of these brands.

I had a Laso installed on my car in 2010. I was told that it's made in Germany, and it said that on the package.

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Marshall Welch
Seattle, WA
1982 300D-T