Comparison of Olefin Copolymers and Comb Polymers in Engine Oil Formulations Tested for Fuel Efficiency Retention and CO ₂ Emissions Under Advanced Emission Standards

This study presents the impact of two engine oil additives on fuel efficiency and CO₂ emissions. Formulations containing either Olefin Copolymer (OCP) or Comb polymer (Comb) were compared in tests for fuel efficiency retention, fine particle emissions, and ash accumulation in the gasoline particulate filter. The Comb formulations showed higher fuel efficiency throughout the testing, retaining this efficiency after three distinct engine aging test cycles. No significant differences between formulations were observed in oil consumption, ash accumulation, and filtration efficiency.