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Yes, and it all depends on the PH of the oil you are using. I will have to look at my notes. My oil at the time came from one place, so I only had to check it every 8 or 10 batches to make sure it had not changed much.

Jeepsinker, This might help for future issues. I made my own bio-diesel for about 3 years out of waste veggie oil. I had to "cook" it in a hot water tank, add a mixture of methanol and lye, and let it settle. After draining off the glycerin, I would pump it into a 55 gallon drum for washing...