I think that more important than lubricating them would be videos of the unboxing and their virgin runs.
I've bought several 141's and 181's this year, brand new in box, and have broken them in gently, slowly running them in, in both directions, unladen, with no problems.
A tiny amount of oil appears to have seeped out of one or two while still in their boxes, but this has not affected their running.
I've never in my life seen locos so smooth, silent or sensitive. Using DC, if the old Hornby controller isn't exactly at zero, the MM Babies will start crawling away while trying to rail them.