Every type of tube I have ever bought from a water cooling store beside the black solid-colored stuff has given problems, so I started using the clear tubing you can buy from your local hardware store and have not had one problem with it, used it for many years, mind you a lot of it has tiny writing on it which most wouldn't want in there cooling looking loop, but for me, water cooling is all about the cooling part.
a note on vinegar it will cause copper to tarnish and corrode much faster, I would only use distilled water or tap water to rinse if I use hot tap water then I would rinse with distilled after, but most of us here have been water cooling on and off for many years and we all kind of find different things that worked over the years.
using car coolant can be done but must be careful, cause from what I have read its not the loop parts that cause a problem it not making sure they're properly cleaned before using them also there are many different types, I would only use a basic glycol and water it down at least 25 to 1, I can remember back in the day, a lot of the pc coolant was just that "car coolant", the Thermaltake coolant I used many moons ago was just car coolant/antifreeze and was nothing but water and dye with glycol.
right now I am using the EK-cryofuel clear in my loop and I am very happy with it so far been in there for over a year and not a thing wrong with it and that loop sits all week only being turned on over the weekends