Cold-pressed oil needs to be heated for longer than refined oil while deep frying. Since these are virgin oils, they are denser and more viscous. Improper heating can lead to foam formation. Too much batter on the food can overload the oil with moisture which causes it to foam up. IndicWisdom Sunflower Oil is made by COLD PRESSING Premium Quality Sunflower Seeds in a Traditional WOODEN CHURNER or LAKDI GHANI at room Temperature. No heat is generated in this process which ensures fatty acid chains stay intact. Why use IndicWisdom Wood Pressed Sunflower Oil? High in Omega-6 Polyunsaturated Fatty Acid (Linoleic Acid) Linoleic Acid is an essential fatty acid which helps maintain normal blood cholesterol Level High in Unsaturated Fatty Acid Rich In Vitamin E (Tocopherols which are natural antioxidants)