The Subaru OEM 10105AC180 master engine gasket and seal kit includes everything you need for a 2008-2018 Subaru STi EJ257 2.5L engine assembly. This authentic master gasket & seal kit is intended for when the engine is apart for any major reseal work, cylinder head service, short block replacement, or rebuild prep and you want OEM precision matched gaskets instead of piecing together mixed aftermarket gaskets.
Subaru built this complete kit to prevent the need for hunting down every engine gasket or seal when doing a rebuild or new install. When the intake, exhaust, heads, cam covers, oiling components, or cooling-related sealing points are disturbed, replacing the required gaskets and seals with genuine Subaru gaskets & seals will help prevents leaks.
This kit is perfect for shops, engine builders, and STi owners who want genuine OEM gaskets for a new engine, reseal, service or rebuild assembly.
Subaru OEM 10105AC180 - Features
- New Genuine Subaru OEM engine gaskets and seals
- Designed for 2008-2018 Subaru STi EJ257 2.5L turbo applications
- Used for major engine reseal, rebuild, overhaul, cylinder head service, and short block replacement work
- Replaces all engine gaskets and seals during assembly
- OE-matched fitment for factory Subaru sealing surfaces
- Reduces the need to source individual gaskets one at a time
- Supersedes Subaru part numbers 10105AB200 and 10105AB2009X
Subaru OEM 10105AC180 – Fitment
- 2008-2014 Subaru STi GR
- 2011-2014 Subaru STi GV
- 2015-2018 Subaru STi VA
Compatibility Notes
- Does not fit 2019+ STi applications
- Does NOT fit non-STi models
- Does NOT replace fasteners, hose, clamp, timing components, fluid, sealant, or one-time-use hardware item required during a full engine rebuild.
- Confirm fitment if the engine has been swapped, the vehicle has mixed-year parts, or the build history is unknown.
Install Notes
- Professional installation is recommended because this kit is typically used during engine assembly, cylinder head service, short block replacement, or complete engine reseal work.
- Clean and inspect all mating surfaces before installing new gaskets or seals.
- Follow Subaru factory service manual procedures for torque specs, torque sequence, sealant placement, and one-time-use hardware replacement.
- Do not reuse old gaskets or seals once removed during engine service.
- Inspect related components while the engine is apart, including head surfaces, valve covers, oil pump sealing surfaces, coolant crossover areas, cam seals, crank seals, and other leak-prone locations.
Package Contents
This Subaru OEM master engine gasket and seal kit includes over 160+ gaskets, seals, O-rings, valve seals, and related sealing components listed below. Subaru kit contents can vary by supersession or packaging update, so verify current contents before ordering if your repair depends on a specific individual part.
- 803928010 - Gasket 28.2x33.5x1 - Qty 3
- 806786040 - Oil Seal 86x103x10 - Qty 1
- 10991AA001 - Cylinder Block O-Ring - Qty 4
- 806931070 - O-Ring 31x2.0 - Qty 1
- 806932030 - O-Ring 32.6x2.7 - Qty 1
- 11034AA000 - Cylinder Block Sealing Washer - Qty 6
- 11044AA770 - Cylinder Head Gasket - Qty 2
- 803912040 - Gasket 12x16x1 - Qty 14
- 806910170 - O-Ring 10x2 - Qty 2
- 806917080 - O-Ring 17.4x2.4 - Qty 1
- 11122AA340 - Oil Pan Sealing - Qty 1
- 11126AA000 - Drain Plug Gasket - Qty 1
- 805323040 - Inner Circlip 23 - Qty 8
- 806742160 - Oil Seal 42x55x8 - Qty 4
- 13091AA050 - Tensioner Sealing - Qty 1
- 13091AA060 - Tensioner Sealing - Qty 1
- 806939040 - O-Ring 39.4x3.1 - Qty 2
- 806969020 - O-Ring 69.4x3.1 - Qty 2
- 13581AA051 - Front Belt Cover Sealing - Qty 1
- 13594AA001 - Front Belt Cover Sealing, 2FR - Qty 1
- 13583AA260 - RH Belt Cover Sealing - Qty 1
- 13583AA270 - Belt Cover Sealing - Qty 1
- 13583AA280 - Belt Cover Sealing - Qty 1
- 13583AA290 - RH Belt Cover Sealing - Qty 2
- 13584AA050 - RH Belt Cover Sealing, 2RH - Qty 1
- 13597AA020 - Belt Cover Sealing - Qty 1
- 13597AA031 - Belt Cover Sealing - Qty 1
- 13592AA011 - Belt Cover Mount - Qty 7
- 13207AA120 - Intake Valve Seal - Qty 8
- 13211AA110 - Exhaust Valve Seal - Qty 8
- 13210AA020 - Valve Collet - Qty 32
- 13270AA190 - RH Rocker Cover Gasket - Qty 1
- 13272AA140 - LH Rocker Cover Gasket - Qty 1
- 13293AA051 - Rocker Cover Gasket, 2 - Qty 4
- 806733030 - Oil Seal 33x49x8 - Qty 1
- 15048AA001 - Oil Pump Sealing - Qty 2
- 806922040 - O-Ring 22.1x3.5 - Qty 1
- 803942020 - Gasket 42x51x8.5 - Qty 1
- 21114AA051 - Water Pump Gasket - Qty 1
- 21116AA010 - Water Sealing - Qty 1
- 21236AA010 - Thermostat Gasket - Qty 1
- 21370KA001 - Oil Cooler Gasket - Qty 1
- 14035AA421 - Intake Manifold Gasket - Qty 2
- 14075AA161 - Intake Collector Gasket - Qty 2
- 16608KA000 - Fuel Injector Seal - Qty 4
- 16698AA110 - Injector O-Ring - Qty 4
- 14038AA000 - Exhaust Manifold - Qty 2
- 44022AA160 - Manifold Crossover Gasket DS - Qty 1
- 44011FA020 - Manifold Crossover Gasket PS - Qty 1
- 803910050 - Gasket 10x14x1 - Qty 2
- 16175AA243 - Throttle Chamber Gasket - Qty 1
- 806933010 - O-Ring 33.7x3.5 - Qty 2
- 21896AA072 - Intercooler Gasket - Qty 1
- 21896AA010 - Intercooler Gasket - Qty 2
- 14719AA033 - EGR Control Valve Gasket - Qty 1
- 14852AA020 - ASV Gasket - Qty 1
- 14852AA030 - ASV Gasket - Qty 1
- 16699AA020 - Pressure Regulator O-Ring - Qty 1
FAQs
Is this a genuine Subaru gasket kit?
Yes. This is a genuine Subaru OEM engine master gasket and seal kit - Subaru OEM part number 10105AC180. This includes every gasket and seal you'll need when rebuilding your EJ257 engine.
What engine is this gasket set used for?
This gasket kit is used for 2008-2018 Subaru STi 2.5L EJ257.
Does this fit WRX models?
This master gasket set is intended for only Subaru STi fitment. If you're using this kit in a vehicle that had an engine swap, please reach out to us to confirm fitment.
When should I use this kit?
Use this kit when the engine is apart far enough that multiple sealing points need to be replaced. Common use cases include short block replacement, cylinder head removal, head gasket service, engine rebuild prep, and full engine reseal work. It is also useful when you want a single OEM gasket kit on hand before beginning a major EJ257 job.
Does this include everything needed for a complete engine rebuild?
No. This is an engine gasket and seal kit, not a complete rebuild package. A full rebuild may also require bearings, pistons, rings, head studs or bolts, timing components, oil pump parts, sealant, fluids, hoses, clamps, and other hardware depending on the condition of the engine and the scope of the job.
Does this kit include head gaskets?
Yes, this is a complete Subaru engine gasket and seal kit. Subaru gasket kits can be affected by supersessions and packaging updates, so always confirm the included pieces for your exact job before the engine is torn down.
Why choose the OEM Subaru kit instead of aftermarket gaskets?
OEM Subaru gaskets are designed around the factory engine tolerances and sealing surfaces. For a stock or factory-style STi engine service, that helps reduce fitment uncertainty and keeps the repair aligned with Subaru service expectations. Aftermarket gaskets may still be appropriate for some built-engine combinations, but this kit is the safer choice when the goal is an OE-style reseal.
Should I replace other parts while installing this gasket set?
Yes, inspect related wear and one-time-use items while the engine is apart. Depending on the job, that may include timing belt components, water pump, thermostat, oil pump seals, head hardware, hoses, clamps, spark plugs, fluids, and any damaged or corroded fasteners. Replacing accessible parts during engine-out service can save labor later.
Warranty
Subaru OEM parts are covered by Subaru's manufacturer warranty when installed and used as intended. Warranty eligibility may vary by installation method, vehicle use, and dealer policy.
