It doesn't matter which way the filter is mounted as far as operation goes, the engine will force the oil thru no matter what the angle. I would mount it vertically, with the filter on the bottom, that way you spill the least amount of oil when changing. It also allows you to prefill the new filter with oil, if you care about such things. Mike At 08:45 AM 3/29/2003 -0800, Jesus Jimenez wrote: My question is: Do I need to leave the oil filter slanted to allow the oil to drip into the motor by gravity or is it alright if the filter is positioned completely vertically upwards. In the old system, the oil flows into the top and comes out of the bottom which leads me to think that maybe the oil needs to flow back into the motor by itself (gravity flow)- On the other hand, I also think that the oil pump should have pressure enough to force the oil out the oil fiter even if it positioned completely vertically upwards.
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