Hi, my name isXXXXX you referring to actual castor oil (vegetable oil) or do you mean Castrol brand motor oil?
If you are referring to castor oil I would not recommend using it. If you are referring to Castrol brand motor oil it is perfectly fine to switch to Castrol motor oil.
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I am referring to the natural Castor Oil which has very good high temperature properties, e.g. the higher the temperature the increased viscosity; although it can be unstable. Why do you not recommend castor oil (or a castor oil + synthetic oil mix) ?