Ahhh yes the dreaded biodegradable plastic on the wiring, I forgot about that. What year did they start using that? Did it only affect the engine wiring harnesses?
What was the last year for the M103?

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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