My 990 has started up even in below zero without the intake heater, however I still will use the heater whenever it's below zero believing that it makes for less wear and tear on the engine. It does hammer away when you start it up when it's that cold without the heater and the plug heater unplugged.  I never heard of a diesel without a heater of some sort, but I suppose if the manufacturer figures the engine will reside in say Cuba......Who knows.
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Oh Beautiful for smoggy skies, insecticided grain,
For strip-mined mountain's majesty above the asphalt plain.
America, America, man sheds his waste on thee,
And hides the pines with billboard signs, from sea to oily sea. _______________________________________________ Some say I have a bad attitude...... "Screw them!"
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