I think I read in one of the owner's manuals that if you are idling for long period as in a long light, they recommended placing the car in neutral. I'll see which owner's manual said that.

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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