rustystud
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I wouldn't know about the negatives but we got to 15F a few weeks ago and my truck started up fine. I needed to keep the RPM's up a bit until it started to get warm, but it still started fine.when the temps get down to the negatives, my Kubota will not start on glow, or ether. I have to use the block heater(coolant) for about 2 hours. Before I installed it, It took about 4-6 hours with a magnetic oil pan heater. My cummins needs its block heater also at those temps. I intend to install one when I buy my M35.