this is what i've done with backpacking stoves many times....

David Marshall wrote:

> This morning it warmed up to -20C and my truck would not start.  When you
> crank over the motor, it barely moved.  So, I took out a 1970s vintage
> Coleman catalytic heater.  I then put this heater right under
> the oil pan of the wasserboxer motor and let it sit there for about 1h.  The
> truck fired right up!
>