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More likely it will be the Canola oil in the Bleu cheese salad dressing.
Canola is simply a re-named industrial lubricant that is not fit for human consumption.
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As for that...I make my own. The good cheese with some milk, Hellman's Olive Oil Mayo and a dash of Worcestershire sauce. I don't use Canola oil. If it's not EVOO it's corn oil, like for frying, which I don't do much of at all.