[AT] Glow plugs

[Mike M]

Hi All,
  I have a question about glow plugs, my Mahindra is the first diesel I 
have owned that has them. In the summer, I don't really bother with 
them, but now that winter has arrived here in Michigan, I assume I 
should be using them all the time. When I turn the key the light comes 
on for about 30 seconds, then goes off, and I fire it up. Is there a 
rule of thumb as to when I should be using them, or is it just whether 
is starts easily enough without them? Will not using them cause any harm 
to the engine? Any thoughts would be appreciated. My old Massey didn't 
have them, if it was below 40 degrees, you plugged in the block heater, 
or you couldn't start it.

Thanks,
Mike M

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