Punching a hole in the filter (TDC) is the way to go... BUT... last week, after changing oil, one engine did not develop enough oil preassure. A piece of the filter (I asume from punching the hole) had fallen and was resticting oil flow.

Just make sure everything is clean and clear. I think this was a freak deal but it happened just the same.

I use the Napa Wix Racing 1060R filters on my 496HOs, and they drain down completely dry once I punch the hole EXACTLY top dead center.

My 'special' screwdriver has the 3/8" square shaft. I filed the tip down to a very sharp point, so it will pierce anything that it goes through. I also was sure to find a screwdriver that is the exact length (actually 1/2 shorter) than the height of the oil filter itself. That way I know it won't exit the bottom of the filter and damage the housing on the way down.

Getting to the fine points of this technique, is it necessary to pierce more than just the outer metal shell of the oil filter to get it to drain its oil?

Anyone?

I've always just pierced the outer shell, I never drive the screwdriver in. Once the vacum is broken, the oil drains right out. I usually do it the night before I change my oil, and the next morning, spin it right off without any mess.

OK, thanks!