I have a proto2 RK L1 mikado steam engine that I ordered in 1999 and recieved it in 2000. It was my first dcs engine. I bought it just to test the new DCS system.
Almost 19 years later and it still runs like new, smoke like a typical MTH engine ( wick has never been replaced ), 5 volt board still working, a great little engine.
I have just oiled and lubed it in the time I had it and it just keeps on ticking.
Dave