I actually use vegetable oil as a lubricant on the lid seal every time prior to locking down the lid on the pot.
I feel the propellant in the pressure pack can of vegetable oil is probably causing the problem.
The propellant must be a very thin hydrocarbon base oil because it turns the Lid seal to something like chewing gum within 12-18 months.
Only light viscosity oil like brake fluid/WD40 is able to penetrate into rubber an do those kinds of softening reactions.
I'm thinking of making a new Lid seal out of silicone rubber. Silicone will resist heat up to 500degC. Silicone melts around 1400degC or there abouts.
Will play some more....
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