Does WD40 even have a purpose nowadays? I guess you can spray it on worms to attract fish.
our local ford dealer recommends spraying it into the lock cylinders before freezing weather to dry out the mechanism.
no more frozen locks! my old Hyundai the the lock on drivers door would ALWAYS freeze before i learned this trick. (and it didn't have remote locks)
This is not a bad use of it, but there's a better lube for that. Tri-Flow. It will do a much better job than WD at lubing and preventing wear over time. I started hitting all the vehicle's locks with it once a year since a Locksmith I knew was passionate about the point. For really cold temps, I've heard locksmiths recommend LockEase over Tri-Flow, but I have no experience w/it.