Synthetic and Fully Synthetic Oil, Synthetic oil (semi-synthetic) is a blend of 70-80% conventional mineral oil mixed with 20-30% synthetic components. Fully synthetic oil is 100% laboratory-engineered with zero mineral content. Fully synthetic oil delivers superior heat protection, extends oil change intervals to 10,000-15,000 km, and provides enhanced engine protection, especially c... https://nicopoil.com/synthetic-and-fully-synthetic-oil/