Dave;
If you must wrench on an oil filter so hard to loosen it, that you break oil filter wrenches, it is surely a sign that it was overtighted, and you must learn from that! I too used to overtighten them (preferring to err on the side of tight, rather than what might happen if it were loose)...but I have changed my ways and consciously tighten on the light side...I too have resorted to C1800's screw-driver piercing last resort, which inevitably makes a huge mess, and typically leads to bloody fingers or knuckles, on the razor blade edges made, if not worse...not to mention turning a 10 minute oil change job into a ruined afternoon...
Always put an oilfilm on the rubber seal of the new filter (I even like to prime filter with new oil...), and resist the temptation to overtighten...
Cheers
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