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    switching from conventional to synthetic for mpg?

    Hello all! New here and I have a question about switching oil. I have a 02 Ranger with the 2.3L, and it's a 5 speed. I currently use castrol conventional 5w-20 and a puralator filter. I change my oil every 5k miles and it always comes out pretty clean. The truck has 167k miles, is my daily...
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