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You probably have some non food grade VO and possibly neem oil, rice bran oil or karanji oil. Non food grade but thinner version of vegetable oils are about 50% cheaper than food grade. Regular corn or cottonseed oil non food grade is about $7 a cubie.
For every vegetable oil, there is an optimum temperature at which it gives the best performance. I wouldn't hesitiate in thinining it out as long as you check the PH
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