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As stated, Hengst is the supplier of the OE filter as well as the aluminum housing bolted to the block and the plastic housing cap.

There is no check or anti drainback valve in the filter....it is integral with the housing. The GM PF2257G filter is now packaged in a conventional red/white/blue GM box, replacing the earlier white box packaging. Hengst is printed on the inlet side of the filter.
I see no difference in the two.

What I do see often though is other brand filters may be slightly longer......just enough longer that they appear slightly crushed upon removal and, so far, it seems the GM filter, early or late, is the only one that comes with a silicone 'O'ring as opposed to some aftermarket units coming with no, or a viton (sp) 'O'ring.
The viton rings tend to get brittle.......I have not seen any cause a leak though.

Rob
 
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