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.
The variables in a brake pad's life are so wide that setting a specific lifespan is almost impossible -- although 30,000 to 50,000 miles (48,280 to 80,467 kilometers) for semimetallic pads is a good guesstimate. Even the type of transmission a car has can affect pad life.