Be aware that all brands of castor bean oil are to a greater/lesser degree Hydroscopic, can in certain circumstances absorb up to six times it`s own weight of water ie, the note of rusting. Way back when I raced 125&250 2 stroke GP motor cycles my engine tuner always very strongly insisted that all fuel be drained from tank/carb,rinsed through with neat gas &any fuel left over dumped.He stated that IHO 7/10 days was the shelf life, after that the effect was noticeable, +any mix left in an alloy/mag tank will after a period corrode at the high tide mark,Something I found to my cost on buying a used 4 stroke race bike that had been standing for some 8 months & the castrol R oil had drained down to the crankcase & at high tide mark had almost rotted through Be observant Guys or it may get expensive
We also used it in our race bikes back in the 70's but other than smelling good, it was a PITA to use, gummy, and not clean at all. It also doesn't stay mixed very well. But at the time, it was the only oil that would allow a modded high revving race motor to survive. It also turned to jello if you accidently mixed petro based oils w/ it.