I have had good luck with WD-40 on all kinds of locks but I live in a failry dry place.

I fleel the WD-40 has enough fluid volume and some pressure that it flushes out metal particles. It also provides some minor rust resistance and lubrication.

It sure works well on the bunch of Chinese Pad Locks I use on my Gates and Sheds and so on.

I have also sprayed WD-40 on keys and inserted them.

Note that graphite offers no rust protection. Lubricants can freeze in cold weather, dry out and leave a sticy residue and or dirt gets stuck to them.

WD-40 does not seem to leave much of a residue on it and the rust protection dimishes over time; I think it eventually evaporates. In the mean time on pad locks you get about 2-3 months rust protection depending on if it rains or not.

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84 300D, 82 Volvo 244Gl Diesel