My record is getting mine to start when it was -6 outside.....took 5 tries of 20 seconds of cranking and about 6 glow cycles, but it did it. Also that was before my timing chain replacement, valve adjustment, and running injector cleaner and so on. Was amazing  So far this winter its only gotten down to 20ish here, and I let it glow about 20-25 seconds on those days, then about 4-5 crank rotations and its running.
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-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)
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