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5w-40

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  1. WalterJ

    OK to use 5W-40 Valvoline Full Synthetic all year in Wisconsin?

    Short story; I've always used fossil Valvoline 15W-40 in my 5.9L diesel. In 6/2018 they changed oil @ 299K using Valvoline Premium Blue Extreme 5W40 Motor Oil by mistake, whew what a change in $$. I noticed a significant positive change in starting in <zero weather & kinda like that! I'm now at...
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