WD40 would kill the strings too... i don't think oil is such a good thing around guitars, (discounting lemon oil and linseed oil for fretboard conditioning)
Why not try teflon or a dry lube?
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Lakewood D32
Taylor K14ce L7
Taylor GA Ltd Cocobolo
Martin Dreadnought Jr 2A
Fender Stratocaster H-S-S
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