Thanks Oz,

I thought the MB customer service was a little light on techn help. As with you i am planning on using the MB coolant as well for no better reason than it is a small price to pay ($10/gal) for what may be equal/no worse than the other compositions available. i'll stick with changes every 2 years as a reasonable compromise in my estimation.

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1972 450SL
1982 300D Turbo