Good Grief ,
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I have observed that cast aluminum oil pans are usually designed to increase the strength of the lower end of the block. I prefer cast aluminum pans regardless though. They seem less likely to leak from any sealing surface.
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Not having had one, do aluminum oil pans have aluminum threads for the oil plug? Or a steel insert? Aluminum threads would seem likely to strip.
I donāt think thereās an insert, at least on most aluminum oil pans. Lots of threads and not a lot of torque when tightening keeps them from stripping, I guess. Although it does happen of course.