ring chain lubes should be used, because the syn. rubber rings will rot out, crack whatever if
engine/gear oils WD40 etc. are used. Once the rubber rings go the roller grease gets out
and it's money wasted.
Also for cleaning the ringed chains, nothing stronger than kero, or the specialised cleaners.
If the above isn't true then I've been wasting my hard earned for at least 8 years because
I buy new bikes and ringed chains is what comes as standard.
Truth is I reckon after a few thousand miles the rings wear to the extent that kero or
cleaner bypasses the rings and washes the lube out anyway!