Which motor oil brand is best?

In the Malaysian market, Shell Helix, Mobil, and Castrol are currently the three most recognized engine oil brands, which have become mainstream choices due to their technological advantages and broad applicability. Shell Helix's gas-to-liquid technology effectively reduces carbon deposits, making it particularly suitable for urban driving conditions with frequent starts and stops. Mobil is renowned for its long-lasting anti-wear performance, with its Mobil 1 series being ideal for turbocharged models or long-distance high-speed driving. Japanese car owners may consider Idemitsu lubricants, whose formulations are specifically designed for Japanese engines. When selecting, prioritize the viscosity specifications in the vehicle manual (e.g., 5W-30) and ensure the product carries certifications such as API SP or ACEA C5. Notably, while fully synthetic oils are more expensive (approximately RM180-RM300 per 4L), their extended drain intervals of up to 10,000 kilometres make them more economical in the long term.