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

.....But my mix is 50% 600w, 25% Marvels Mystery oil, and 25% Canola oil. RAPE seed oil is banned in the US.  Something about the acids and cancer.  But I can truly say that I have done my own small tests and the mix does work. The rpms picked up right after it started to work into the bearing surfaces. I have used it ever since. This mix never goes into the lubricator. 600w super steam oil only for that engine. I had to buy 5 gals of it because thats the only way I could get it.  I had bought oil from PMR and it's just not the same as the 600w from Mobil. PMR's oil may be good for their engines, but not for the Stuarts. Kind of like oiling a Jensen with Wilesco oil. Not the same.

Side note:
My version of Keith's mix smells great!
The 600w Super Steam oil also smells great from the exhaust. If you are a steam fan...then you will understand what I mean.  Certain oils just don't have that smell! 

That matches up to my thoughts well about keeping the blend out of the lubricators in favor of straight SCO.  I’ve been looking for a place to buy less than the 5 Gallon bucket of Mobile 600w, but didn’t find any.  Guess a life-of-type buy is in order. 

I know what you mean about the smell of these oils.  While I never sailed on a recip steamer, I’ve spent nearly 50 years around 2190 TEP, and marine steam plants.  There’s something about that smell that makes ya feel at home. I’m guessing the Mobile oil is similar.