DuPont Deep Freeze Penetrating Oil, 11-Ounce Releases rusted parts by freezing and causing contraction and micro cracks in rust and oxidation Proven technology supported by 2 years of field testing Feature specialized penetrating agents and oils that penetrate into, break down and release rusted, corroded frozen parts Works when all else fails; Freezes parts down to -40 degrees F and brings back to life rusted mechanisms Includes oils and rust inhibitors to provide lubrication and protection after use