Originally Posted by THE TECH
None of that explains why the plug would strip coming OUT. Going IN, definitely possible.
If it was put in cross threaded it could pull the threads out of the pan on the way out. You are right though, should be impossible to strip threads on the way out if the plug was installed properly....... I'd bet the damage was done on the last service!
I change my own oil on my M3 every ~8000KM (5000Miles). The first time I changed the oil at ~10000KM I had to use an easy out on the plug in the rear sump because the dealer put it in so tight after the break in service that the allen head socket stripped out the plug.
I don't understand for the life of me why people like to put such small fasteners so tight.