Page 244 of the Owner's Manual states:sjlee said:What is the recommended oil weight for the TSX?
Oil is a major contributor to your engine's performance and longevity. Always use a premium-grade 5W-30 detergent oil displaying the API Certification Seal. This seal indicates the oil is energy conserving, and that it meets the American Petroleum Institute's latest requirements.
Honda Motor Oil is the preferred 5W-30 lubricant for your vehicle. It is highly recommended that you use Honda Motor Oil in your vehicle for optimum engine protection.