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.
In the mist of various fluid replacements, a minor emergency got me distracted, and the master cylinder for the clutch went dry and no doubt brought in some air into the lines. (Same thing with the brakes but I got that squared away). Anyways, I can't bleed the damn thing now, and been trying for 2 days.