[ChicagoBob]

I recall, that after I installed pans about 25 years ago, one of the flanges at the oil pan edge broke after only a couple of weeks, leaving the pan edge to rub against the engine and make a horrendous graunching noise as the car moved. Turns out this was a service bulletin item. I recall that Ford's solution was to remove the offending flange and use only one oil pan bolt.