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When the paper element deforms or bulges under pressure, nothing goes wrong - it still filters (unless it was a poor enough design to allow enough deformation to tear the element). When a carboard pressure bypass valve deforms under prssure, it's likely to leak. I can get a "FLAPS" type of filter here for about NZ$15. A genuine BMW filter costs NZ$22 (US$10). The genuine part weighs twice as much, has a metal bypass valve housing, and an anti-drian valve that actually works. I'll pay the extra NZ$7 thanks. I think these filters are MANN or MAHLE produced - whether their "FLAPS" range of filter is of lower quality, I have no idea. Allan W :-) New Zealand 58 Beetle 70 "Fonzie" 70 Squareback ----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> To: <type3@vwtype3.org> Sent: Monday, September 16, 2002 7:05 AM Subject: Re: [T3] Type engine longevity On 15 Sep 2002, at 19:11, Allan Williams wrote: > Most fram filters ARE a bypass - the valve uses a cardboard housing. This sounds like a slam, but it shouldn't be. Cardboard is a perfectly good material to use here. Note that ALL filters use a paper element, and no one complains about that. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/