car is 2001 acura integra 123k miles. i always do my oil changes cold. ive used oem honda, purolator pureone 14610, and royal purple filter. These are the SKINNY/narrow filters, i may try the older fatter ones next time. Every time i take off my filter, not a drop of oil is in there or drips from the engine block. When i do hot oil changes, there is oil in the filter and dripping from the block. Inside my garage is kind of slanted downhill and my driveway is completely flat. When i do my oil changes, i jack up just the front. When i check my oil level inside the garage, the dip stick shows excessively above the full line, however when its in the driveway, its right on the top dot. 1)Is this going to affect my car in the long run? 2)How exactly is the anti drain back valve suppose to work? 3)and where does the retained oil lubricate on start up??