Overtime Mazda changed their filters for the FD as they reduced inventory by consolidation of similar parts into less required parts. Thus our filters become smaller in diameter.
Doing research I came up with this that I used. It is the original diameter which gives more filtering area and less back pressure. It also has been rated in the top in filter tests.
Purolator PureOne Oil Filter
PL14459: RP = 12-15psi diff, ht = 2.95", wt = 3.15", anti drain back
It use to be painted metallic blue and is now non-slip dull mustard.
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