Cometic BMW N54B30 .040in MLX Cylinder Head Gasket 85mm Bore - C15257-040

The Cometic BMW N54B30 .040in MLX Cylinder Head Gasket 85mm Bore - C15257-040 is a precision-engineered head gasket with a 85mm bore and .040" compressed thickness.

The Cometic MLX Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring MLX Multi-Layer Steel (MLS) construction, this gasket uses multiple embossed steel layers for superior sealing under extreme cylinder pressures and temperatures. Precision CNC-machined to exacting tolerances, this gasket seals combustion, water jackets, and oil passages simultaneously — eliminating the need for multiple gaskets or sealing compounds.

• Material: MLX Multi-Layer Steel (MLS)
• Bore Size: 85mm
• Thickness: .040" compressed
• Part Number: C15257-040

Verified fitment: BMW X6 (2008–2010); BMW Z4 (2009–2016).