The Subaru / Robin 280-23501-17 Engine Piston Ring Set helps maintain proper compression and control oil within the engine cylinder. These piston rings fit around the piston and create a seal against the cylinder wall, helping reduce combustion-gas leakage while supporting efficient engine operation. They also help regulate engine oil and limit excessive oil consumption during the pis... https://www.wholetoolbox.com/subaru-robin-280-23501-17-engine-piston-ring-set/280-23501-17.html