Auto Service World
News   May 10, 2012   by Auto Service World

MLS Head Gaskets Solve Sealing Issues in Many 2.5L Subaru Engines

Federal-Mogul has introduced two next-generation Fel-Pro PermaTorque MLS head gaskets that help eliminate sealing concerns on the full range of Subaru 2.5-liter SOHC and DOHC “boxer” engines dating back to the 1996 model year.

Thousands of these engines might be susceptible to sealing problems related to the use of original equipment-style composite or early-generation multi-layer-steel head gaskets.

The new Fel-Pro PermaTorque MLS head gaskets combine Federal-Mogul’s aftermarket-proven multi-layer-steel gasket technologies with a next-generation LaserWeld™ stopper layer design, developed and validated in partnership with NASCAR® Sprint Cup engine builders. Each gasket also includes a proprietary coating technology that accommodates a wide range of surface finishes encountered in the aftermarket repair environment.

Many of today’s more powerful yet lighter-weight engines present difficult sealing challenges for conventional head gaskets. In particular, increased casting motion between the head and block surfaces can quickly cause scrubbing and/or crushing damage to composite-style gaskets.

“Using a replacement composite style head gasket on these engines will very likely lead to repeat sealing failure,” said Fel-Pro Product Manager Jim Daigle. “The only solution is to use a modern, high-quality MLS gasket engineered specifically for the repair environment. While the MLS gasket might cost more than a composite gasket, the overall cost will be much lower when compared to an expensive sealing failure.”

The new Fel-Pro PermaTorque MLS gaskets are available in complete head gasket sets for the following applications:1999-2009 Subaru 2.5L SOHC (EJ251, EJ252 and EJ253)

Fel-Pro head set: #HS26170PT1

1996-1999 Subaru 2.5L DOHC (EJ25D)

Fel-Pro head set: #HS26167PT; HS26167PT-1; HS26167PT-2

2004-2009 Subaru 2.5L DOHC Turbo (EJ25T, EJ255 and EJ257)

Fel-Pro head set: #HS26259PT; HS26259PT-1

The LaserWeld stopper layer now featured in many Fel-Pro PermaTorque MLS head gaskets helps maximize combustion sealing by precisely controlling the compression of each gasket’s layers. This helps reduce head lift, prevent gasket damage and ensure a superior combustion seal over a broader range of operating conditions.

“LaserWeld is the new standard in head sealing,” Daigle said. “This technology is another example of our ability to help engine builders anticipate and address the challenges associated with rising combustion pressures, temperatures and increased casting motion in each new generation of engines.”

For more information regarding Fel-Pro PermaTorque MLS head gaskets, contact your engine parts supplier, visit

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