Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I’ve got friends who swear MMO is basically hydraulic fluid. It looks and smells very much like military aircraft hydraulic fluid. Basically anything sold as top cylinder lube or in a pinch, bog  standard hydraulic fluid in a light ratio would do. I’m not a fan of heavier two stroke oils designed for 100 to 1 mix in high performance outboards and such. This is a low compression, low speed engine. It doesn’t take a lot, and the rings are petroleum resistant. If your nix feels just a tiny bit slippery between your fingers, it’ll do.