Originally Posted by kawgomoo
ok this guy scares me. cutting threads with a tap will leave shit in your oil pan just as much as a drill bit. steel pans have to be welded, they are not thick enough to tap threads into. alu pans can be tapped or welded.
as i have stated...if you punch a hole in the pan the excess metal goes inward making it think enough to tap threads in a steel pan...i have done it at least a dozen times.but i will agree with you there is no substitute for welding the fitting on the pan,it is the best way to get it done.
and as for tapping vs drilling....with drilling you can get long slivers of metal that will not come out when you change the oil after you perform a job like this...when you tap the pan tho,all the small shavings get drained with the oil.