Piston Ring Sets: for Toyota. Bus, Truck, Aristo, Avensis, Caldina, Camry, Carina, Estima, Rav4, Corona, Celica, Crown, etc. United Material Piston Rings: for Toyota Engines Compression Ring | Intermediate Ring | Oil Ring We offer different versions of piston ring sets in original equipment quality as well as for older engines with the aim of reducing their compression loss and normalizing oil ...