if bought new there should be a diagram with the engine that will sort of show how to get it apart and you can refer to the product reference diagram page for help, but once apart clean any old grease and replace with new grease...put a light and I mean light coat of oil on all bearings and friction spots on the drive train...Bachmann makes a nice selection of lubes but you can get some from your local hobby shop, just ask for help if needed as not to get the wrong stuff...a good lube job made my first 2-8-0 quieter and run better... hope this helps