9F this morning, mine started in 2 seconds.

MB battery, good wiring, good starter, good glow plugs, synthetic oil, valves properly adjusted, and good compression all make for easy starts.

I don't even need to press the pedal to start mine.

So far my record for starting is -12F.....

And thats all without a block heater.

Wind makes no difference to the glow plugs, they are sealed inside the pre-chamber....it will get just as warm in there with 50mph wind as with no wind at all.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)