<https://irishrailwaymodeller.com/topic/4561-grease-or-oil/#comment-72780>
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"I've always been recommend peco gear lube, obviously for gears, but I've never tried it myself, although I do use some very fine oil that I bought from Squires for moving parts such as valve gear and coupling rods. "
<https://irishrailwaymodeller.com/topic/4561-grease-or-oil/>