Loctite is used specifically where a thread backing out would be catastrophic. Be advised that there are several color coded types of Loctite and you don't want to use the incorrect type. Antiseize is a good idea for any fasteners where heat or dissimilar metals can result in thread seizure and stripping. Wayne Dempsey's 911 engine book has some excellent discussions of the use of loctite and antiseize.
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