John, I had a guy with a NIB MLW Bi-Polar put two full droppers of fluid in the locomotive. This was at a local club. Another member told him he did not have enough in and filled it again. You know where all that fluid went. When I asked him why he put that amount of fluid in, he stated that is what he thought he should do. I could not get an answer on why he thought that. I pointed out the book that came with the locomotive and he said he did not read it. Those people do exist and are a problem to anyone sharing rails. Would anyone want to run their new locomotive on that oil soaked track? That would require an instant tire change.
I agree with you on replacing a smoke unit. They can all be repaired.