hi PAUL regarding the mixing of castor with petrol and using it within 24 hrs, that would apply to castrol M ,the oil i am refering to is a different product called COOLPOWER, degummed and fortified castor oil it mixes readily with petrol, stays mixed untill ready for use in the future just like like normal 2 stroke oil,the benifites are pleasant sweet smell, low smoke,and easier to breathe, i think it is a vegetable product it is made for use in small 2 stroke engines rgds graham