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.
Amongst the racing / ricer communities, it is popular to use other / aftermarket brake fluid. Aftermarket fluids are fine as long as they meet DOT 3 or 4. However, Honda's PS fluid is special - only use the OEM stuff as it is thinner than other stuff - using thicker aftermarket PS will possibly damage the seals.