The preferred technology for many late-model vehicle engines is multi-layer steel (MLS). Recognizing that replacement applications typically offer less-than-ideal sealing conditions, Federal-Mogul engineers created an MLS technology that addresses the true aftermarket repair environment. The result is the Fel-Pro® line of PermaTorqueMLS products.

PermaTorqueMLS head gaskets offer a wide range of benefits, including: 

• Strategically placed sealing beads that help eliminate leak paths
• Extra-strong stopper layers that provide superior primary combustion sealing (where applicable)
• Full-hard stainless steel material that maintains its shape despite thermal expansion and scrubbing between the block and head
• A unique, application-specific coating that enhances sealability

What’s more, Fel-Pro PermaTorqueMLS head gaskets provide the torque retention required to maintain positive contact pressure between head and block over the life of the repair.

MLS technology is specified on most current U.S., European and Asian engines in production.