Из мануала про новый 1NZ-FXE
* The piston skirt is coated with resin to reduce friction losses.
* Lowtension piston rings are used to reduce friction and achieve excellent fuel economy.
* The outer surface of both the No. 1 compression ring and oil ring is coated with Physical Vapor Deposition (PVD), and the outer surface of the No. 2 compression ring has been chrome plated, offering wear resistance.
* The oil ring is a threepiece type, and use of the oil ring contributes higher reliability and lower friction.