ramffml
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I've cut these filters open(Purolator Boss PBL 24651, WIX XP 57899XP)in the recent past and am posting a few pics again, for arguments sake and visual for comparison to the Royal Purple 20-820.
The Purolator Boss PBL 24651 imo, is just as good or equal quality as the Royal Purple 20-820.
The by-pass valve on the Purolator Boss is different that it is fixed to the bottom of the filter using a spring retainer type clip instead of the traditional "leaf spring" by-pass valve set up that most of the other filters have.
The WIX XP 57899XP(Royal Purple 20-820 equivalent)has an altogether different by-pass spring. The filter media rests on an coiled spring, unlike the leaf spring style, and the by-pass valve is independently spring loaded.
The filter media on the Purolator Boss PBL 24651 has instead of an "metal screen" it has an synthetic type mesh that is very resilient to being torn/ripped. The media is also very competitive as the RP 20-820. The "SmartFUSION TECHNOLOGY" on the Purolator Boss is rated 99%+ on dirt removal capacity and 15,000mi/24,000km.
The WIX XP 57899XP filter media is an carbon copy of the Royal Purple 20-820 having the metal screen mesh on the filter media
The bass plates on the WIX and Purolator Boss have only six inlets compared to the Royal Purple 20-820, but are rather large, so I wouldn't think that that would hamper oil flow, idk.
Over all, IMHO, these two filters in comparison to the Royal Purple 20-820 are a good quality match.
Thank you sir. So just to be clear, if I wanted the same size filter as the RP 20-820 and the Fram XG2, the Purolator Boss # for that filter would be: 24651? I'd like the larger(est) boss, not the smaller one.