[CNY_Dave]

5-w30, 10 year old battery, no blankets or heaters, starts a treat at -18F.

Good battery is all you really need, and I think the factory water-oil cooler under the oil filter is a really great thing to have in the cold weather, the water heats the oil when it's cold out.

 

[CNY_Dave]

15 minutes of idling will probably put more water into the oil as engine will stay cool longer and the moist gases in the crankcase will condense.