Does anyone know the shelf life of Castor Oil?  I have a jug that looks OK, but it is over a year old. If the contents have not separated, it should still be viable, right? I would hate to blend some fuel only to find it has damaged an engine.

I have a pint bottle of SIG Pure AA Castor Oil that has separated. It was purchased just prior to 9/11 when I was working in Tucson AZ. I've used half of the contents but haven't touched the bottle in two years. There is visible separation about 1/8 of an inch in the bottom of the bottle. It's not water, because it is vicous like oil and it has a definite solid, stringy looking blob floating in the bottom puddle. So what I am seeing is three substances in this bottle. Since there is only about seven ounces left, I am going to dispose of it. I have a fresh bottle (well, 6 months old) of Castor and a gallon of methanol, and a friend that works weekends at the local dragstrip who can get nitromethane. I am going to blend some fuel for my Fox engines, and since this is my first attempt at this, I was curious about shelf life.