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Oh man, this made me think of something! Due to the small diameter of the oil lines drainage is negligible. If the filter is positioned open end down then there will be a noticeable difference since the (HP-1) filter holds almost a full quart of oil. Okay, this is what got me thinking. My system, with the 1.5 oil sump, consumes 5 quarts of oil, including PREFILLING THE FILTER! I'm gonna guess that those of you with pressure problems are not prefilling the oil filter, hence you will show roughly a quart low and this can register with reduced oil pressure readings, particularly when going around corners. This is what I do when I change my oil: Drain all the oil from a warm engine. Remove oil filter, let drain, then light it on fire an toss into street (just kidding, wanna make sure yer payin' attention :) Fill oil filter with fresh oil. Like I said, a Fram HP-1 almost uses a full quart. Once the filter is just about topped off, smear a fine film of oil around the filter gasket and screw into filter mount. Now fill engine with oil like normal. Close up engine, start her up, let run for half a minute or so, then turn off. Let oil settle for about 10-15 minutes then recheck the oil level. Add more oil if need be. You're done. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- >Where's your oil filter located? Is it level w/ the sump, above ore >below? Vertical or horizontal? > >If it's above, you migh think about how much oil is >actually in the system. When the engine is 'cold', the oil >has drained >oil of one or more lines and maybe even out of the filter >(depending what angle the filter is mounted on). > >let's say you ckeck the oil level on the 'cold' engine and it >reads "full" >on the dip stick. But, when you run the motor, the lines and >filter need >to be filled up, so the motor is actually running low on oil. >Hence the light comes on.