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 piston’s movement. This ring set is a suitable replacement for worn or damaged rings that may contribute to reduced compression, smoke, or poor engine performance. Replacing worn rings can help restore compression, improve combustion efficiency, and support smoother, more dependable engine operation in compatible applications.