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    Mobil 1 301 vs 303 GMC 6.5

    Hi Folks, Long time lurker need some advice pls. By accident I put a M1-301 filter instead of the M1-303 filter on my 98 GMC 6.5 diesel. The only difference is that the 301 has a 30 PSI internal bypass valve. All I noticed is a higher steadier OPR on my factory OP guage. Is this filter ok to...
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