Wouldnt try it myself. Firstly oils from differing manufacturers should mix fine, but:
Differing brands measure "WEIGHTS" of oils differently, the only way of being accurate would be to know the true CST of each oil to be mixed. and,
Even if you know the CST of the oils to be mixed, 500cst and 400cst mixed in equal measure does not make 450 cst.
All too much of a headache to me.
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