In a 2T engine, castor has it's place. Way back when troglodytes roamed the earth, high strung, ported to bleeding edge, leaned out air cooled motocross bikes ran castor just to finish a race without seizing. Castor continues to degrade to platelets that allow parts to slide against each other, even when the oil film is low or nearly non existant.
It comes with a price though. Tearing down any engine that has run castor for a while, and it's a sticky, gummed up and carbon infested mess. When 2T went power-valved and water cooled, castor dropped out of favor for cleaner burning petroleum based lubes.
De-gummed castor is better, that's about all you'll find now.
Castor mixes readily with alcohol, so of course experimenters have run castor in alcohol fuels to lube the upper end at very high ratio's, 500:1.
Castor mixes with petroleum as well, it is certainly possible to replace an ounce of the petro oil with an ounce of castor in your simple piston port weed wacker, saw, whatever if you want that smell. But really no benefit in modern times. There was a time when castor was king, but the monarchy is dead.