Solving Sealing Issues on 2.5L Subaru - Engine Builder Magazine
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Solving Sealing Issues on 2.5L Subaru


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

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The new MLS head gaskets combine Federal-Mogul’s aftermarket multi-layer-steel gasket technologies with a "LaserWeld" stopper layer design, developed 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 Jim Daigle, Fel-Pro product manager. “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.

This information was provided by Fel-Pro

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