MAHLE 40009.030 Engine Piston Ring Set Oversize - 0.030

The MAHLE 40009.030 is a premium OEM-grade engine piston ring set sized at +0.030" oversize, engineered to restore proper compression, minimize oil consumption, and extend engine service life. MAHLE is a global original equipment supplier to the world's leading engine manufacturers, and their replacement piston rings are built to the same exacting tolerances as the factory originals.

Key Features:

• +0.030" Oversize — designed for engines that have been bored 0.030" over the standard specification
• OEM-quality materials — ring materials, coatings, and tension levels optimized for reduced friction and extended service life
• Plasma-moly or chrome facing (per application) — provides superior wear resistance and faster, more efficient seating
• Precision-machined ring flanks — maximize ring-to-piston groove sealing for improved compression retention
• Engineered to OE requirements — reduces ring mass and friction while minimizing blow-by and oil consumption
• Complete set — includes upper compression ring (UCR), lower compression ring (LCR), and oil control ring (OCR) assembly for all cylinders

MAHLE piston rings are developed using advanced simulation and computer-aided engineering tools to minimize friction and deliver measurable performance gains. Each set meets or exceeds original equipment specifications, making them a trusted choice for professional engine builders and technicians performing engine rebuilds or overhaul work.