There is a wide variety of cooking oils from plant sources such as olive oil, palm oil, soybean oil, canola oil (rapeseed oil), corn oil, peanut oil and other vegetable oils, as well as animal-based oils like butter and lard.
We called a couple of the brake fluid companies and the answer was two to five years is a safe number for an unopened container. Wilwoodâs tech line claims that if the container is sealed, they feel it has an unlimited shelf life, but I would consider five years to be the limit.
Just again so you have a side by side comparison, this is brand new brake fluid in comparison to brake fluid with 100 plus thousand miles on it that has never been changed. Most brake fluid flushes will be anywhere from 50 to 100 bucks depending on the size and capacity of the system.