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I use 0w30. It's has better ratings than 5w30 for protection, but it's a lower cold viscosity. And, M1 has better mileage claims on the bottle, so it's probably true. I put the stuff in when I put the van on the road, but I was getting better than EPA right the first tank I put the van on the road, before I really knew how to drive it.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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