Thanks,
I've learned more about my car in the last four months on this forum than I did in the 25 years of ownership.
I'll have to look at my Zerex bottle to see it's the right type. I know is was listed for aluminum.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html