MAHLE Original® piston rings are the most technically advanced piston rings in the industry. Driven by OE requirements; reducing friction and ring mass while minimizing engine oil consumption, and providing longer service life. MAHLE is one of the largest OE piston ring manufacturers in the world and leads the industry for the latest piston ring technology. PartNumber : mhl42279CP.040 Description : Engine Piston Ring Set Engine Components::Piston Rings