ORIGINAL: alcarafa
I don't think CP will harm any engine if you add some castor oil to it, at least this engine is working like hell and that is what it was intended to do, or what I wanted.
Rafa,
CP is already 17% all synthetic oil.
If you add 3% castor oil to it, you would have roughly 20% oil.
The Omega, as it comes, is 4.9% castor oil and 12.1% synthetic (break up 17% 30/70).
Why bother buying additional castor oil to add to CP, if you can have the castor oil pre-mixed in Omega?
Seeing the engine perform in the short-run has no bearing on the end result...
Both Morgan and OS say you should use castor oil in the fuel for ABC engines...
But hey, it's your engine and you can do whatever you want with it.