Automotive engine oils are primarily categorized into four types: mineral oil, semi-synthetic oil, fully synthetic oil, and high-performance fully synthetic oil. Mineral oil is directly refined from crude oil, offering lower cost but inferior durability, making it suitable for older vehicles or low-mileage usage. Fully synthetic oil is produced through chemical synthesis, exhibiting exceptional high- and low-temperature stability and anti-wear properties, making it suitable for turbocharged engines or high-performance models. For instance, test data for the Castrol Edge 5W-30 SP series demonstrates that its high viscosity index (172) and molybdenum friction-reducing formulation can prolong engine life. High-performance fully synthetic oil incorporates specialized additives (such as CoolTech in the Petronas Syntium series) and is engineered for extreme driving conditions, including racetracks or heavy-duty vehicles. When selecting oil, consult the viscosity specifications (e.g., 5W-30) and API/ACEA certifications (e.g., SP or A3B4) outlined in the vehicle manual. Additionally, purchasing through authorised channels is recommended to ensure quality and prevent engine damage caused by substandard oil.
