I remember reading somewhere that Castrol Motor Oil is derived from a plant - Caster plant (spelling ?). Is there any truth to this ?. I am pretty sure I read that on one of Castrol's foreign websites. If this is true is there any benefits of using an oil from such a source ?. I heard that Redline oils are based on vegetable derivatives, would this be somewhat similar ?, just guessing, any info would be interesting. thanks
Joey