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06 OBW 2.5, 05 Forester, had 03 H6 OBW
5,882 Posts
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.
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