Here in Virginia Beach, VA this morning we had 15 deg F temperatures.

My 2005 CDI glowed for a few seconds, then fired right up.

Since it's a Texas car, I have not seen a plug and harness for the block heater, but if it starts like this when it's 15 deg F, I don't see any need for one.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles