If stored in a freezer, then anything can be stored for 20 or 50 years. They brought oil from warehouses to us in the army from the 50s. But if stored at a temperature of 0 degrees, then it is unlikely that it will last a year. There was normal oil in the USSR. Preservatives in this oil to hell. I'm even afraid to buy. After freezing, natural animal fats do not crumble when cutting (even lard, even butter), but hydrogenated vegetable fats crumble due to the presence of water. You can check it yourself, without a laboratory.
palm oil is not a preservative; in fact, it is a harmful substitute for animal fat. Chemical compounds are used to increase the service life.
The presence of palm oil in food products, including butter, does not affect the shelf life.
The shelf life of butter is affected by the storage temperature and substances that prevent the oxidation of the butter - antioxidants can be added.
Your Food Technology Center www.food2000.info
Video course for food industry professionals: Labeling of food products in the Russian Federation. Modern requirements
Refer to the oil label. She cannot cheat. Manufacturers are obliged to indicate the absolutely exact composition, since some ingredients can cause allergic reactions, and if the composition is indicated incorrectly, this is fraught with damage to health and millions of claims against the company.