BiodieselJeep.com wrote:
Never really plug it in. only gets as low ar 5-10 F most winter nights. Takes 8-12 "rer-rer-rer"'s to start on the worst days, and I mix Biodiesel in at some proportion all winter. Wouldn't worry about it at all.
About ice for newbies: remember that 4 wheel drive is great for getting you (or others) out of a snow bank......but doen't change your odds much about getting into one! And Jeep-based-overconfidence (hey, its a risk that comes with the Jeep) will certainly help get you into one. Drive safe and happy jeeping!
To echo this, it has to get awfully cold to NEED a block heater. I think long-term, it'll reduce wear if you're startups are in cold temps for months at a time. I'd speculate you're more likely to experience fuel gelling than to have a day so cold that the glow plugs aren't enough to warm things up.
http://www.powerservice.com/ makes some good additives that you can pick up at wallymart or better fuel depots which will add lubricity, improve cetane rating, AND lower your jell point. It never hurts to use those in the winter. It got me out of a jam with B100 in february in atlanta last year
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids