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I've seen quite a few T1 and T3 full flow systems and all the ones I've seen have the mouth of the filter pointing up. The only way oil is going to drain out of these is if they have a screwdriver slammed though 'em :) Yes, you don't want the oil draining from the filter. When I change my filter I fill it with almost a full quart of oil before attaching it. I also need to fill the pump-to-filter oil line with oil to help prime the pump if the oil should drain from this line (no big deal, really). Besides, if you mounted the filter mouth down can you imagine the mess when you need to change the filter and all the oil comes draining out? Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.pobox.com/~toby_erkson/ >-----Original Message----- > You are probably right >in that oil >could be leaking backwards into the sump via the regulation or by-pass >valve. This is not good, because when starting up the engine >it will take a >l-o-o-ng while to build up any oil pressure, as the filter is >empty. Not >good for your bearings... >BUT! There are oil filters that have a built-in valve function >to prevent >backwards draining of the filter. ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org