MAHLE 4050-300S 4.050" 3.0mm Oil Ring Expander Standard Tension

The MAHLE 4050-300S is a precision-engineered oil ring expander designed for high-performance engine builds requiring a 4.050-inch bore diameter. This standard tension expander is specifically sized for 3.0mm oil ring assemblies and provides consistent radial pressure to ensure proper oil control ring seating against the cylinder wall.

Key Features:

• 4.050-inch bore diameter for precise fitment
• 3.0mm width compatible with standard metric oil ring sets
• Standard tension design for OEM replacement and performance applications
• Manufactured by MAHLE, a leading OEM supplier to major automotive manufacturers
• Ensures uniform oil ring contact pressure around the entire circumference
• Helps prevent oil consumption and maintains proper lubrication

Oil ring expanders are critical components in piston ring assemblies, providing the outward spring force that keeps the oil control rings in contact with the cylinder wall. The MAHLE 4050-300S delivers reliable performance in street, performance, and racing applications where precise oil control is essential for engine longevity and efficiency.