Copper pipe is coated with a light oil (think WD40) to keep it corrosion free while on the shelf. You need to clean the machine oil off the copper before use. Your method probably did as good of a job as the vinegar. After I built mine, I wiped it down with Acetone and then wiped it down again with a Vodka soaked paper towel.
If your chiller was bright like a new penny, and felt dry (not oily) to the touch, you got nothing to worry about. If not, the oil probably evaporated out when you stuck your chiller in the boil for 15 minutes. You did that right?
If not, a little oil never hurt anyone.