MAHLE 224-3921WR-0.25MM Engine Piston Set +0.25mm Oversize with Rings, Pin & Clips

The MAHLE 224-3921WR-0.25MM is an oversize (+0.25mm) engine piston set manufactured to original equipment (OE) standards, delivering factory-level fit, performance, and durability for engine rebuilds. MAHLE is one of the world's largest OE piston manufacturers, supplying pistons to major automakers globally before offering the same components in the aftermarket.

Key Features:

• OE-Quality Construction – Engineered to the same exacting standards as original factory pistons, ensuring a precise fit and reliable performance
• Compensated Ring Grooves – Designed to maintain proper ring loading and oil control throughout the piston's service life
• Expansion-Controlled Design – Tight fitting clearances help reduce engine noise, minimize wear, lower emissions, and improve oil control
• +0.25mm Oversize – Sized for use with bored cylinders that have been machined 0.25mm over the standard bore diameter
• Complete, Ready-to-Install Set – Each piston comes pre-assembled with mounted piston rings, wrist pin, and retaining clips for easy installation
• Trusted OE Supplier – MAHLE is a leading global supplier of pistons and engine components to original equipment manufacturers worldwide

The WR designation indicates this piston set includes rings, wrist pins, and clips — everything the engine builder needs for a complete, professional installation. This set is ideal for engine rebuilders seeking OE-quality components at a competitive price point.