Okay, I just went to do an oil change on my Prius for the first time. I drained the oil, and discovered that my old universal oil filter wrench didn't fit. I couldn't get the oil filter off. So, I refilled the oil, and plan on changing the oil filter tomorrow after I buy a new oil filter wrench. Are there any significant problems with this? -->Adam
I did the same and changed the filter 2 weeks later. Not a problem. You will lose only a couple of ounces of oil. Not enough in my case to warrant adding extra.
I do believe that you would still have a filter full of dirty oil being mixed with the new - that's the only drawback I can think of.