Piston Ring Set 4.035 1.5 1.5 3.0mm

The MAHLE PISTONS Piston Ring Set 4.035 1.5 1.5 3.0mm (Part Number 4035MS-15) is a precision-engineered ring kit designed for high-performance eight-cylinder engine builds requiring exact bore dimensions and controlled compression sealing. This file-fit piston ring set delivers the controlled tension and material composition necessary for engines targeting consistent blowby control and ring longevity across varied operating conditions.

Built from ductile iron with plasma moly coating, these rings provide superior wear resistance and reduced friction compared to conventional cast iron rings. The 1.5mm top ring, 1.5mm second ring, and 3.0mm oil control ring configuration represents a modern compression package optimized for both street and competition applications. Plasma moly plating protects ring faces from scuffing during initial startup and prevents accelerated wear under sustained high-RPM operation. Standard tension ensures reliable sealing without excessive side pressure that can lead to ring flutter or rapid cylinder wall degradation. The file-fit design permits precise ring gap adjustment to match specific engine displacement, compression ratio, and fuel type requirements—critical for engine builders who demand repeatability and control.

This ring set serves engine builders, performance shops, and rebuilders preparing eight-cylinder mills for both street and circuit duty. Buyers installing this kit typically pair it with matching pistons, proper ring gap instrumentation, and honing procedures to achieve OEM or tighter tolerances. MAHLE's Performance Series designation indicates this kit is engineered for builders who understand the relationship between ring specification, bore finish, and engine longevity.

Piston ring selection is foundational to engine reliability. A 4.035-inch bore with standard-tension compression rings suits small-block applications where controlled gap and minimal friction take priority. File-fit kits require hands-on fitting and bore verification; they are not drop-in components and should be installed only by builders equipped with proper measuring tools and ring gap setting experience.