Reply #13: If the battery is in good shape, it should start the car... [View All]

[TreasonousBastard]

down to zero and below. The right oil is probably a little more important to reduce initial friction in the engine.

Should you be reasonably paranoid and don't have another car that would start so you can jumpstart the car, one of those jumpstarting gadgets sold at parts stores would work, or you could by a cheap battery and charger and have it ready in case the car battery craps out-- these would be far more convenient than taking the car battery in and out of the car when it's 10 below out there.