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    Is 10w 30 better than 5w 30?

    Change from a thick to a thin mineral oil If you are eg running Mobil 1 brand 15W-40 and change it to Multi-grade mineral oil, 5W-20 your gas mileage will probably go down 30%! What happens is that your oil flows faster and for that reason never get hot enough to require a thicker 40 grade oil...
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