I was taught to fill the oil filter most of the way when doing an oil change. Usually, by the time I put the oil filter back on, I'm pretty annoyed and just put the empty filter on. I do put a light coat of oil on the rubber gasket though.
Last oil change, I noticed after start up my oil pressure was very low for about 3-5 seconds. I'm sure 3-5 seconds is enough time to do a little bit of damage.
How much damage is this causing? Am I taking an hour off my engine's life or a decade?
I obviously will change my procedure next time, but I'm just curious how bad it is. My engine still runs so I know it's at least not catastrophic!