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Plenty cold here in NE but I use no additives until below zero. 5w-40 valvoline full synthetic year around. Always starts never had a problem. Fuel mileage is always down in winter due to “cut” fuel. 2-3 mpg. Not a daily driver either.
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2016 Keystone Sprinter 298FWRLS
2021 Ram 3500 DRW CC LB HO Aisin 4.10 50 gal.
Anderson 5th wheel hitch
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