have a look in the forums here there is a oil chart that shows all the different ones and what they are equivalent to in other oils, so you don't have to go out and replace the ones you have.
There is also a program on the net that helps you make your own.
Like if you want 25 and you only have 17 and 40 then it will tell you how much of each you need to blend to get 25. cool right
I cant find them just now but will post back later
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