MAHLE 224-3709WR.040 Engine Piston Set with Rings Pin Clips

The MAHLE 224-3709WR.040 is a complete engine piston set built to original equipment (OE) standards, engineered to deliver reliable performance and long service life. MAHLE is one of the world's largest OE piston manufacturers, supplying major automotive and powersports OEMs globally, making their replacement pistons a trusted choice for professional engine builders and rebuilders alike.

OE-Quality Engineering:

• Compensated ring grooves ensure proper ring loading and precise oil control throughout the piston's service life
• Expansion-controlled design allows for tight fitting clearances, reducing engine noise, wear, and emissions while improving oil control
• .040" oversize specification for use in bored or worn cylinder applications requiring sizing beyond standard dimensions
• Ready-to-install kit includes mounted piston rings, wrist pin, and retaining clips — everything the engine builder needs in one package
• Manufactured to meet or exceed OEM dimensional tolerances and material specifications

The "WR" designation indicates this set comes complete with rings included, streamlining the rebuild process and ensuring ring-to-piston compatibility straight from the manufacturer. The .040 oversize makes this set ideal for engine rebuilds where cylinders have been bored to restore proper geometry and surface finish.

MAHLE's deep OE manufacturing heritage means each piston undergoes the same quality controls used in original factory production, giving engine builders confidence in fit, function, and durability.