OEM specified. Permatex® Ultra silicones were developed to meet today’s technology changes. Sensor-safe, low odor, non-corrosive. Outstanding oil resistance and joint movement tolerance. Eight times more flexible than cork/composite gaskets; three times more oil resistant than conventional silicones. Temperature range -65ºF to 500ºF (-54°C to 260°C) intermittent; resists auto and shop fluids and vibration.