I just ordered and received a smoke unit for my engine. I installed it without issue. I added a couple of drops of oil and ran the train and the smoke poured out like I expected. I ran the train until the smoke stopped. A couple of hours later I added more oil and ran the train, but no smoke.
This engine is probably 25 years old. I remember that I had this happen before, when new, I added oil, it smoked, then no more smoke.
Any thoughts on why I get only one "smoke" from the unit and then nothing?

Thanks,
GpaJer


Thanks for the feedback and information.
The engine is a Bachmann HO scale. In reviewing the instructions with the engine, no where does it say to not let the smoke unit run dry. It says to replenish the oil when the smoke stops. The instructions say to only put a few drops of oil at a time in the smoke unit.
This is sure disappointing. I have kept my HO set for over 50 years and now I want to share with my grandsons. You know that they'd get a kick out of the smoking engine.

Thanks again and Merry Christmas!