Is 0W-20 Oil Fully Synthetic?

[LaReagan]

Not necessarily. Although 0W-grade oil generally has better quality within the same brand, the key factor lies in the base oil composition. Some oils labeled as fully synthetic may only perform at semi-synthetic levels. Most major brands' 0W oils on the market are fully synthetic. Fully Synthetic Oil: The recommended replacement interval is one year or 10,000 kilometers. Due to its superior performance and stronger oxidation resistance, fully synthetic oil can be used for longer periods. Semi-Synthetic Oil: The replacement interval is 8 months or 7,500 kilometers, while mineral oil only lasts 6 months or 5,000 kilometers. Note that this interval considers both time and mileage - replacement is required when either limit is reached, without waiting for both conditions to be met.