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My 99 Powerstroke needs to be plugged in (block/fuel filter heater) for an hour minimum when below the freezing mark. I think I need a set of GPs...it will, however start instantly with a small quik shot of ether into the intake. I use Power Service DieselKleen 8-10oz in every tank of fuel which helps also.
Also check the age, and strength of the batteries, it is reccomended to replace both of them at the same time if they are weak, and go for the high CCA batteries.
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