Mahle Rings 4.0350 Bore Dia 1.2MM Edge Width Steel Plasma Moly Top Ring Moly Ring Set

Starting with a 1.2mm edge width on the top ring, this Mahle OE piston ring set is built with a steel plasma moly construction. This material choice is key for handling the heat and stress inside the cylinder, helping to ensure a solid seal between the piston and cylinder wall. The bore diameter is precisely 4.0350 inches, matching factory specifications for many applications where a rebuild or overhaul is underway.

The plasma moly coating on the top ring is a notable detail, offering improved wear resistance over standard cast iron rings. This means the rings can maintain their sealing ability for longer, even under demanding conditions. The accompanying oil control rings are also designed to work in tandem, managing oil consumption and preventing excessive blow-by. When you're putting an engine back together, getting the piston ring setup right is critical for performance and longevity, and this set from Mahle OE is a well-built option for that job.