ORIGINAL: r2champion
If you said before that you wasn't sure of the oil content, I would agree that adding some castor oil would be a safe precaution. However, above you stated 18% oil content, so there is no need to add anything. You probably recieved the recommendation to add the castor oil simply because of the unknowns you had stated. The oil content (percentage) is much more of an important factor than the type of oil used be it synthetic or castor.
You're right! At first I couldn't find the oil content of Tower's fuel; it doesn't say anywhere on the label. I think that's when I started hearing stuff and asking about oil content and adding castor. I later saw that they advertise that it meets OS Max specs, so it SHOULD have at least the 18%. I am assuming that it is a synthetic blend because a search of Tower's fuels show the only ones that contain castor are the premium blends, which Tower's generic fuel obviously is not. Nowhere does it actually say that the fuel is 18% lubrication, but again, it says it meets OS Max standards.
Well I have 6oz of castor that I have no other use for, and 3 quarts of tower fuel. From what I'm gathering from this thread it wont hurt to mix it together. Using all 6oz would be a 22.8% oil blend, which is OK to use for the first 3 quarts?