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 : mhl42280CP.020 Description : Engine Piston Ring Set 2006-2009 Cadillac STS V V8.4371cc Engine Components::Piston Rings 2006-2009 Cadillac XLR V V8.4371cc Engine Components::Piston Rings