I have a bottle of Stan that I used 3 mls out of about 8 months ago so it still has 17 left BUT it is out of date 6 months ago. Should I still use it or has bacteria grown in there now since I have used it before and broken the seal? I know it doesn't matter too much with an out of date oil but I think the water based might be a different story. What is the usual cut off point before you throw it out? Thanks guys.

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