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    5W-40 Winter Compatibility

    Hey guys. So I live in one of the colder states where it routinely hits subzero temperatures in January/February with spikes below -20 F. I'm looking at AMSOIL's signature series 5W40 diesel oil, and is there any reason not to use this for my 6.5 L HMMWV in the winter? My thoughts are that it...
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