Last time a change oil on my 540 this happends
http://www.autopower.se/galleriet/bloggbilder/00019029_s640.jpg
with the oil plugg. M12/½.
Make me a new oilplugg from a standard M12½ bolt and clean the treads in the oilpan who seems OK.
I buy a new oilplug to next oilchange proberly the cheapest part that i have buy from the local BMW dealer.
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