The Subaru EJ25 engine line demands reliable sealing solutions to handle 2.5L displacement and 16V configurations. This guide highlights five MLS (Multi-Layer Steel) head gasket sets that are commonly used with EJ25-powered Subaru vehicles, including Outback, Impreza, Forester, and Baja models. Each product section covers compatibility, key features, and what to verify before purchase, helping you choose a gasket set that balances sealing performance with durability.
Buying at a glance: the following table summarizes the five highlighted head gasket sets and their primary attributes.
| Product | Brand | Key Feature | Inclusion Note |
|---|---|---|---|
| CNS MLS Head Gasket Set for EJ25 | CNS | MLS head gaskets; compatible with 99-05 Subaru/Saab 2.5L | Upper plenum gaskets not included |
| FEL-PRO HS 26170 PT-1 | Fel-Pro | Proprietary coating; broad Subaru compatibility | Check Amazon Confirmed Fit for exact vehicle |
| EJ25 Engine Rebuild Kit (GPQ) | GPQ | Complete kit including head gasket set and water pump | Includes O-rings, timing belt kit, and more |
| Cometic Gasket C4264-040 | COMETIC | .040 inch MLS head gasket; Subaru EJ25 | Basic packaging info; weight/light kit |
| AUCERAMIC HS26170PT-1 | AUCERAMIC | MLS head gasket set; multiple gaskets included | Specific fit for various 2.5L Subaru models |
CNS MLS Head Gasket Set for EJ25
Brand: CNS
Compatible with: 99-05 Subaru/Saab 2.5L 2458cc H4 SOHC (16 Valve), EJ25. Features MLS head gaskets. Upper intake manifold gaskets (plenum gaskets) are not included. This set is designed for engines commonly found in mid-1990s to early-2000s Subaru models, focusing on reliable sealing performance under typical EJ25 operating conditions.
FEL-PRO HS 26170 PT-1 Engine Gasket Set for Subaru
Brand: Fel-Pro
Compatibility: Fits 1999-2003 Subaru Impreza; 2004-2004 Subaru Forester; 2000-2003 Subaru Baja; 2003-2005 Subaru Baja family variants; includes proprietary coating to support sealing against rougher finishes. Before purchasing, use the Amazon Confirmed Fit tool to verify year, make, model, and engine configuration. Coating is designed to withstand sealing surfaces up to around 80 Ra.
GPQ EJ25 Engine Rebuild Kit & Head Gasket Set
Brand: GPQ
Fits: EJ253-based Subaru engines across Forester, Impreza, Legacy, Outback, and Baja models (2006-2011 for Forester; 2007-2012 for Impreza; 2010-2012 for Legacy; 2010-2012 Outback). This rebuild kit includes a head gasket set with bolts, water pump, timing belt kit, valve cover gaskets, valve stem seals, and more. It covers multiple part numbers and is suitable for a comprehensive EJ25 refresh, with multiple included components that help complete a full assembly compatible with 2.5L non-turbo engines.
Cometic Gasket MLS .040 Head Gasket for EJ25
Brand: COMETIC
Compatibility: Subaru EJ25 engines. The gasket is MLS with a .040 inch thickness. The listing provides package dimensions and weight, indicating a compact, performance-oriented option for sealing EJ25 cylinder heads against warpage and high-heat cycles. The kit’s primary detail is its MLS composition and thickness, suitable for moderate-to-high-performance builds.
AUCERAMIC HS26170PT-1 MLS Head Gasket Set
Brand: AUCERAMIC
Compatibility: 1999-2005 Subaru Forester and Impreza; 2000-2005 Legacy and Outback; 2005 Saab 9-2X; 2003-2005 Baja 2.5L H4 SOHC. This MLS kit includes multiple gaskets and seals aimed at a complete head gasket replacement, with part references such as HS26170PT-1 and related numbers. The set includes multiple gaskets for intake, exhaust, valve covers, seals, and a head gasket pair suitable for EJ25 configurations.
Buying Guide: Key Considerations for EJ25 Head Gaskets
- Engine code and model range: Ensure the gasket set matches your specific EJ25 variant (SOHC, 16V, non-turbo). Many listings mention EJ25 and EJ253; verify the engine code and vehicle year for compatibility.
- Gasket composition: MLS offerings are designed for repeated thermal cycling with improved sealing. Confirm if a full gasket kit (including intake/exhaust gaskets, valve cover seals, and bolts) is included or if you need to purchase separate components.
- Coating and finish: Proprietary coatings help seal rougher surfaces. If your engine block or heads show minor surface irregularities, a coated gasket set can improve sealing reliability.
- Fitment verification: Use the Amazon Confirmed Fit or vehicle-specific fit notes to confirm compatibility. Subtle year/model differences can affect whether a gasket set will seal properly.
- Included hardware: Some builds require head bolts, timing belts, and water pumps. Identify whether the kit includes these items or if you must source them separately.
- Intake and plenum gaskets: Some sets exclude upper plenum gaskets; plan accordingly if your rebuild requires those seals.
- Warranty and return policy: MLS head gaskets are a long-term investment. Review product warranties and ease of return if the part does not fit your vehicle.
- Repair scope: For engines with prior head gasket failure, consider combining a head gasket kit with a timing belt kit and water pump to address all wear points in a single service cycle.
- Shop-tested brands: Favor brands with established Subaru gasket compatibility (CNS, Fel-Pro, Cometic, Auceramic, GPQ) to reduce the risk of sealing issues over time.
Choosing the right head gasket set for the EJ25 involves balancing compatibility, kit contents, and the intended use of the engine—daily driver reliability or performance-oriented builds. The five options highlighted here represent a cross-section of MLS-based solutions frequently used across Subaru EJ25 platforms, with variations in included hardware and coating technologies. Always verify fit and component inclusions before purchase to align with your repair or rebuild plan.