Viscosity improver system for lubricating base oil produced in Thailand / Wilaiporn Hluanglertkajorn = ระบบสารปรับปรุงความหนืดสำหรับน้ำมันหล่อลื่นพื้นฐานที่ผลิตในประเทศไทย / วิไลพร เหลืองเลิศขจร
This research aims to discover properties and applications of dual viscosity index improver systems by comparing with existing single viscosity index improvers currently used by domestic petrol chemical industry. The research investigated possible combinations of two viscosity index improvers in base oil by studying the viscosities of each system at various rations The dual viscosity index improvers systems were then used to formulate engine oil API grade SJ/CF SAE 20W50 for specification examines. The results indicated that several dual viscosity index improvers systems can be used to replace the currently existing single viscosity index improvers.