BMW Piston Ring Set - Genuine BMW 11257840940

Ensure optimal engine performance and longevity with the **Genuine BMW Piston Ring Set (Part No. 11257840940)**. These precision-engineered, standard-size piston rings are vital components for maintaining proper engine compression, controlling oil consumption, and ensuring efficient heat transfer within your high-performance BMW engine.

As an original BMW part, this set guarantees a direct fit, superior quality, and adherence to exact factory specifications, offering reliable operation and preserving the integrity of your engine.

This piston ring set is a direct replacement for:
* **BMW M5 (E60/E61)**: 2006-2010 models with the 5.0L V10 S85B50A engine (requires 10 rings per car).
* **BMW M6 (E63/E64)**: 2006-2010 models with the 5.0L V10 S85B50A engine (requires 10 rings per car).
* **BMW M3 (E90/E92/E93)**: 2008-2011 models with the 4.0L V8 S65B40A engine (requires 8 rings per car).

Replace worn piston rings with this genuine BMW component to restore peak engine efficiency, power, and prevent costly damage. Also supersedes OE Part Number 11257836578.