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NGK 127 Spark Plug
| Brand | NGK 127 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Non-Removable Nut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Projected Square Platinum Electrode - High Ignitability |
| Hex Size | 5/8 |
| Insulator Height | 50.50 |
| Manufacturer Heat Range | 6 |
| Part Number | SIFR6A11 |
| Pre-Gap Size | .044 |
| Reach | .75 |
| Resistance | 5000 |
| Seat Type | Flat |
| Stock Number | 127 |
| Thread Diameter | 14.00 |
| Product line | Laser Iridium High Ignitability Spark Plug |
| Fits | Subaru · 6 vehicles |
Laser iridium design. Delivers precise ignition and dependable performance.
High ignitability electrode. Promotes efficient spark delivery for smoother combustion.
OE supplier heritage. Built by NGK, a long-time original equipment manufacturer.
Cross-references AMS Automotive 4702, DENSO Auto Parts 4504 and Hayden 127 for the same application. See all 7.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
NGK Laser Iridium Spark Plug for Subaru
The NGK Laser Iridium High Ignitability Spark Plug, part number 127, is built for direct OE-style service on select Subaru applications. It combines an iridium center electrode with a projected square platinum ground electrode design to support consistent ignition performance and stable combustion.
Key Features
- Laser Iridium High Ignitability spark plug from NGK
- Iridium center electrode tip material for durable spark delivery
- Projected square platinum ground electrode design for high ignitability
- Pre-gapped to .044 for the listed Subaru applications
- 14 mm thread diameter, .75 reach, flat seat
- 5,000 ohm resistance with a non-removable nut terminal
- OE-style replacement for Subaru Legacy and Subaru Outback service
Product Details
NGK part number 127 is a Laser Iridium High Ignitability Spark Plug engineered around OE specifications for 2010-2012 Subaru Legacy and 2010-2012 Subaru Outback models. The copper core center electrode, iridium tip, nickel ground electrode core, and standard single-ground configuration are selected to support reliable ignition under everyday driving conditions. This plug uses a flat seat, 5/8 hex, and a manufacturer heat range of 6, making it a direct-service option for Subaru Legacy and Subaru Outback maintenance when the original application calls for a high ignitability plug.
NGK is a long-established OE supplier with broad coverage across domestic and import vehicles, and this product reflects that OE-focused approach. The part number 127 is also referenced as SIFR6A11 and cross-references DENSO Auto Parts 4504 for the same application.
What It Helps Address
- Rough idle caused by worn spark plug electrodes
- Hard starting from weakened ignition output
- Misfire conditions related to plug wear or gap drift
- Reduced throttle response from inconsistent spark delivery
- Service interval replacement on Subaru Legacy and Subaru Outback models
Installation Notes and Tips
Fits 2010-2012 Subaru Legacy, N/A. Fits 2010-2012 Subaru Outback, N/A. Confirm the OE specification before installation, including the .044 gap and high ignitability requirement noted for these Subaru applications. Use proper spark plug service procedures, verify thread engagement by hand before tightening, and inspect ignition components during replacement to maintain consistent performance. Part number 127 should be matched to the listed engine application and service interval requirements.
Quality Assurance
NGK manufactures spark plugs with OE-level standards and extensive North American coverage, backed by decades of automotive ignition expertise. Part number 127 is built to meet the application requirements for the listed Subaru Legacy and Subaru Outback fitments.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2012 | Subaru | Legacy | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2012 | Subaru | Outback | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2011 | Subaru | Legacy | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2011 | Subaru | Outback | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2010 | Subaru | Legacy | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2010 | Subaru | Outback | 2.5L | H4 | N/A | OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Gap 0.044"; Actual OE Manufacturer; 60,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
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