I'm no expert on this subject, but bio-diesel is different from cooking oil and, at the price you're quoting, I'm guessing you are talking about cooking oil not bio-diesel. Diesels can run on cooking oil, but they need to be started with regular diesel and then swicthed over and then switched back, before they are shut down. But, to answer the question, I have never (knowingly) run bio-diesel in my boat.
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