BMW and Toyota have famously used bio-derived insulation reported to be like catnip for rodents.

The bio-oil plasticizers also migrate out more quickly in thermal cycling than the old dead dinosaurs approach. Hilariously, when I asked my mechanic about getting an M5, he laughed and explained that the radiator components are known to turn brittle and crack after 5-6 years because of this.

(I don't envy automotive folks. The stuff they have to deal with is next level.)