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    2015 Mazda3 2.5L Amsoil SS 0W-20 @ 6589, 22800 mi.

    This is my first post; I've lurked and learned for a long time. 2015 Mazda3 with the SkyActiv 2.5L engine. First owner. I ran factory fill for 1000 miles, then Amsoil Signature Series 0W20 with the OEM filter, as there wasn't consensus that the Amsoil (or any aftermarket) filters had the...
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