Cometic C15257-040 BMW MLS Cylinder Head Gasket Bore - N54B30 85mm

The Cometic C15257-040 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for the BMW N54B30 turbocharged inline-6 engine. This gasket features a .040" (1.0mm) compressed thickness and an 85mm bore diameter, making it ideal for high-performance and forced induction applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• .040" compressed gasket thickness for optimal compression ratio tuning
• 85mm bore diameter precisely matched to N54B30 specifications
• Viton rubber gasket material coating resists heat, oil, and coolant
• Engineered to handle high cylinder pressures in turbocharged applications
• Allows for deck resurfacing and custom compression ratios

Cometic MLS head gaskets are the choice of professional engine builders and performance enthusiasts worldwide. The multiple layers of stainless steel with advanced rubber coatings provide maximum sealing performance while accommodating the thermal expansion and contraction that occurs in high-output engines. This gasket is compatible with BMW N54B30 engines found in 335i, 135i, Z4, and other turbocharged BMW models from 2006-2016.