MAHLE 42143.040 Engine Piston Ring Set Oversize - 0.040

The MAHLE 42143.040 is a complete engine piston ring set engineered to OEM specifications for reliable engine rebuilding and performance restoration. The .040 oversize designation (+0.040" / +1.00mm) makes this set ideal for engines with bored cylinders, ensuring proper fitment and optimal sealing in freshly machined bores.

MAHLE Motorsports is a globally recognized Original Equipment Manufacturer (OEM) supplier trusted by major automakers and professional engine builders worldwide. Their piston rings are manufactured with tight tolerances to restore compression, reduce oil consumption, and deliver long-lasting durability.

Key Features:

• Oversize Specification: +0.040" (1.00mm) over standard bore diameter for use with bored engine blocks
• OEM-Quality Construction: Manufactured to original equipment specifications for precise fit and function
• Complete Ring Set: Includes all rings required for a full engine rebuild
• Superior Sealing: Engineered ring geometry promotes optimal combustion chamber sealing and reduced blow-by
• Oil Control: Multi-piece oil control ring design minimizes oil consumption
• Corrosion Resistance: Premium coatings protect ring surfaces against wear and corrosion
• Consistent Gap Tolerances: Precision-ground end gaps reduce the need for custom fitting during installation

MAHLE piston ring sets are a trusted choice for professional engine rebuilders and automotive technicians performing engine overhaul or rebuild applications. Matching the correct bore size to your machined cylinders is essential — always verify your bored cylinder diameter before ordering.