MAHLE 40451-020 Precision-Ground Performance Piston Rings 0.020" Oversize

The MAHLE 40451-020 is a precision-ground piston ring set manufactured to exacting OEM tolerances, designed for engine rebuilding and performance applications. Featuring a 0.020-inch (0.50mm) oversize specification, this ring set is engineered for use in bored or honed cylinders that have been machined to the standard first oversize dimension.

MAHLE is a globally recognized OEM supplier trusted by major automotive manufacturers, and their aftermarket ring sets deliver the same quality and dimensional accuracy as original factory components. Each ring in the set undergoes precision grinding to ensure proper ring-to-wall contact, optimal sealing, and consistent oil control.

Key Features:

• 0.020" (0.50mm) Oversize — designed for first-oversize bored cylinders
• Precision-ground ring faces for optimal cylinder wall seating and break-in
• Engineered to OEM dimensional specifications for proper end gap and radial depth
• Superior sealing performance reduces blow-by and maintains compression
• High-quality materials provide excellent wear resistance and long service life
• Oil control ring design minimizes oil consumption
• Complete ring set includes compression rings and oil control ring assembly per cylinder

Whether used in a street rebuild or a performance engine build, the MAHLE 40451-020 piston ring set delivers reliable compression sealing and oil control. Compatible with engines requiring standard first-oversize ring sets — always verify bore diameter and ring groove dimensions before installation.