If your dash is black, you will be fine. It is the blue dashes that crack, I should know both of my TD have blue interiors. My father owns an '85 300D with a black dash it only has 1 small crack up by the windhsield.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member