Given how dark the pictures are I can't help but wonder if it's not a lack of oil but a change of oil.
Manowar use the clean, straight out of the bottle oil with gloss and shine. Black metal looks a bit dirtier, more like oil that's come out of a diesel engine after 12 months of running.
Well I certainly hope he doesn't extend the wear time of that loincloth by turning it inside out.