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.
While we compared brake fluid flushing to oil changes earlier, this service doesnât need to be done as often. You can change the fluid out every three years or about every 24,000 miles, whichever comes first. When you do get your fluid flushed, be sure you are using the right kind of brake fluid.