I use Red and Tacky grease, and I use Castrol Syntec 10W40 synthetic motor oil. I had contacted the company, and was informed that Castrol Syntec is safe for plastic and nylon gears, as well as the plastic bodies. Have been using the same quart of Syntec for about four years now, and I lube a fair amount of locos for my collection and for customer locos. Never a complaint.
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