Mahle MS 4.090in+ .005in 1.5 1.5 3.0 mm File Fit Rings

This is a Mahle file fit piston ring set, part number 4095MS-15. These rings are designed for engine rebuilding applications where precise fitment is crucial. The set features a 1.5mm top ring, a 1.5mm second ring, and a 3.0mm oil control ring, all with standard tension.

The key feature here is the 'file fit' design, which means the end gap of the rings is intentionally left slightly oversized. This allows you to precisely file the ends to achieve the exact clearance needed for your specific cylinder bore. This is important for optimal sealing and performance, especially in performance or custom engine builds. The rings are sized at 4.090 inches plus an additional 0.005 inches, ensuring a proper fit in many common engine builds. This well-built set from Mahle is a solid option for mechanics who need to dial in ring-to-wall clearance.

Please note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for correct installation procedures and ring gap specifications.