Started it at 12* yesterday and 9* today (twice each). It takes 15-20 seconds of GP before it will start, but once it gets there it fires off promptly. I didn't recheck the plugs after the relay incident, but I do know that I broke the tab off of one of them. And one of them is a recycled 13G plug (not intended for 15-second glow times). So we're down at least one plug, and likely more. But it still started, even in single digits. Wifey asked if I'm gonna start using the block heater, but I wanna see how far I can go with this. It cranks over quite quickly, so I think it's just a matter of waiting for enough BTUs to pour into the combustion chambers. Big Blue cranks much more slowly, and I do not think it would start by itself at this temperature. It has in the past, but it's more tired now.