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  1. J

    Amsoil users please advise

    I have a 2005 Century with 14L 60 series Detroit,just over 900,000 miles. It is an egr engine but it is turned off. I was going to change to synthetic for extended oil changes and hoping for better mpg. I'm told some of the drivers here in WI are using the Amsoil series 3000 5w-30 I believe with...
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