AJUSA MLS LHS CYLINDER HEAD GASKET TO SUIT SUBARU FORESTER SH SJ FB25A 2.5L F4Ajusa Cylinder Head Gasket: Precision Engineered for Engine Protection Ajusa Multi Layer Steel (MLS) head gasket is meticulously designed to provide a reliable seal between the engine block and cylinder head, ensuring efficient combustion and preventing fluid leakage. A failing head gasket can cause overheating, coolant loss, white smoke, misfires, and oil contamination, often due to internal leaks that may lead to serious damage if left unresolved.