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    EFL-910 vs. FL-910 on a '06 Mazda Tribute 2.3l?

    Just changed out my oil and filter on a 2006 Mazda Tribute 2.3l, 1100 miles. The stock filter was a FoMoCo EFL-910...I installed a Motorcraft FL-910 as the app-guide said it was the correct fit. Used Castrol GTX 5W-20. Engine seems to run quieter after the change (less knock and the...
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