Nissan Frontier Engine for Sale | Used QR25DE 2.5L Inline-Four
$1,999.00
At a Glance
- Condition: OEM used QR25DE 2.5L inline-four engine assembly, compression tested, oil condition assessed, external components documented per unit
- Availability: In stock for Nissan Frontier applications (donor 2005, QR25DE 2.5L four-cylinder per the source data)
- Shipping: Free shipping to all 50 states, 5 to 10 business days
- Application: Nissan Frontier, QR25DE 2.5L four-cylinder (donor 2005 per the source data) – Nissan’s mid-size pickup
- QR25DE 2.5L: Nissan’s 2.5L inline-four DOHC 16-valve engine variant used in Frontier I4 applications
- Engine note per source: This is the 2.5L four-cylinder, NOT the 4.0L V6 – does NOT replace the V6
- Transmission compatibility: Manual and automatic per the source data – confirm engine-and-transmission pairing by VIN
- Timing chain maintenance: Strict 5,000-mile oil changes and regular timing-chain checks per the source data
- Cross-batch pair: See our Nissan Frontier Transmission listing (RE5R05A automatic) for the transmission side of the drivetrain
- 15 day replacement warranty on component defects
Description
About the Nissan Frontier Engine (QR25DE 2.5L Inline-Four)
Need a replacement Nissan Frontier QR25DE 2.5L inline-four engine? Part Nests sources OEM used QR25DE 2.5L inline-four engine assemblies for Nissan Frontier applications (donor 2005 per the source data). The Nissan Frontier is Nissan’s mid-size pickup positioning – Nissan’s key mid-size pickup offering. Critical engine note per the source data – this is the 2.5L four-cylinder, NOT the 4.0L V6. Does NOT replace the V6. Compatible with manual and automatic transmission – confirm engine-and-transmission pairing by VIN. Strict 5,000-mile oil changes and regular timing-chain checks recommended. Cross-batch pair – see our Nissan Frontier Transmission listing (RE5R05A automatic) for the transmission side of the drivetrain. Each engine is compression tested with oil condition assessed. Call (855) 634-4447 to verify Frontier year, engine variant confirmation (QR25DE 2.5L I4 vs VQ40DE 4.0L V6), and transmission pairing before ordering.
What Is Included and Not Included
| Detail | Description |
|---|---|
| INCLUDED | The QR25DE 2.5L engine assembly as photographed; confirm the exact configuration at order. |
| NOT INCLUDED | Transmission, accessories not pictured, and fluids; transfer your undamaged accessories at install. |
| Tools You Need | Standard engine-swap tools and fresh oil and filter; per the live FAQ, keep strict 5,000-mile oil changes and regular timing-chain checks. |
Nissan Frontier Vehicle Context
- Nissan’s mid-size pickup: The Nissan Frontier is Nissan’s mid-size pickup positioning – Nissan’s key mid-size pickup offering competing in the mid-size pickup segment. Established Nissan nameplate with strong US market presence. Positioned to compete with the Toyota Tacoma (see our related Toyota Tacoma Transmission listing), Ford Ranger, Chevrolet Colorado / GMC Canyon, Honda Ridgeline (from a functional cross-shopping perspective), and various other mid-size pickup competitors
- 2005 donor era context: The 2005 donor era falls within the second-generation Nissan Frontier (D40 platform, 2005-2021 approximately). Second-generation Frontier introduced various platform / engineering upgrades from the first-generation D22 Frontier. Nissan V6 and I4 engine options offered across the second-generation Frontier era
- Frontier engine option context: Second-generation Frontier was offered with two engine options: 4.0L VQ40DE V6 (higher-power option, part of Nissan’s VQ engine family) and 2.5L QR25DE I4 (this application, economy engine option). Per the source data, this is the 2.5L four-cylinder – does NOT replace the V6. Critical distinction – I4 and V6 Frontier applications are completely different engine platforms not cross-compatible
- Cross-batch Frontier drivetrain pair: This QR25DE engine listing pairs with our Nissan Frontier Transmission listing (RE5R05A automatic 5-speed, V6 or I4 compatible per that source data). Complete Frontier drivetrain sourcing available across our engine and transmission listings for Frontier applications
Nissan QR25DE Engine Context
- Nissan QR family: The QR25DE is part of Nissan’s QR engine family. QR family variants include QR20 (2.0L) and QR25 (2.5L – this application). Standard Nissan inline-four engine family used across various Nissan applications during the era. Established Nissan engineering with typical Nissan reliability characteristics
- QR25DE applications: The QR25DE engine variant is used across various Nissan applications including the Nissan Frontier (this application), Nissan Altima (various generation configurations), Nissan Rogue (various generation configurations), Nissan Sentra (various generation configurations), Nissan X-Trail (international markets), and various other Nissan applications. Widely deployed Nissan inline-four engine variant across various Nissan applications
- Timing chain architecture: The QR25DE uses timing chain architecture (vs timing belt). Timing chain provides longer service life vs timing belt but requires various age-related service considerations. Per the source data, regular timing-chain checks are recommended for long-term engine reliability. Various QR25DE timing chain guide wear concerns have been documented across higher-mileage applications
- Oil change frequency: Per the source data, strict 5,000-mile oil changes recommended. Various QR25DE variants have documented oil consumption concerns on higher-mileage applications – strict oil change frequency is important for long-term engine reliability. Standard Nissan practice for QR25DE oil change frequency compliance
Related Nissan / Frontier Cross-Application Listings
- Nissan Frontier Transmission: Cross-batch pair – RE5R05A 5-speed automatic (V6 or I4 compatible) – see our Nissan Frontier transmission listing
- Nissan Pathfinder Transmission: Related RE5R05A 4×4 variant (mid-size SUV, R51 era) – see our Nissan Pathfinder transmission listing
- Nissan Titan XD Transmission: Related Nissan heavy-duty pickup (Aisin AS69RC 6-speed automatic) – see our Nissan Titan XD transmission listing
- Nissan Armada Engine: Related modern Nissan V6 (twin-turbo V6) – see our Nissan Armada engine listing
- Toyota Tacoma Transmission: Direct Frontier competitor (R155 5-speed manual, RWD) – see our Toyota Tacoma transmission listing
Engine Specifications
- Type: OEM used QR25DE 2.5L inline-four DOHC 16-valve engine assembly for Nissan Frontier (donor 2005)
- Function: Inline-four engine provides economy motive power for Nissan Frontier mid-size pickup applications. Standard Nissan QR-family engine architecture with appropriate power / fuel economy characteristics for economy pickup applications
- Construction: The QR25DE 2.5L engine assembly as photographed per the source data. Confirm the exact configuration at order
- What is not included: Transmission, accessories not pictured, and fluids per the source data. Transfer your undamaged accessories at install. Standard practice for used engine replacement scope
- Tools required: Standard engine-swap tools per the source data. Fresh oil and filter. Strict 5,000-mile oil changes and regular timing-chain checks per the live FAQ
- Common failure modes: Compression loss, oil consumption (various QR25DE variants have documented oil consumption concerns on higher-mileage applications), valvetrain wear, timing chain guide wear, various age-related component wear. Symptoms include engine performance loss, oil consumption, check engine codes, various powertrain integration issues
- Testing: Compression tested, oil condition assessed, external components documented per unit before shipment
Vehicle Compatibility
| Detail | Description |
|---|---|
| Nissan Frontier, QR25DE 2.5L four-cylinder (donor 2005) | VIN confirmed at order |
| Engine note | This is the 2.5L four-cylinder, not the 4.0L V6; per the live FAQ it does not replace the V6 |
| Transmission | Compatible with manual and automatic; confirm the engine-and-transmission pairing by VIN |
| Reference Application | 2005 Nissan Frontier Engine |
Why Buy From Part Nests
- OEM verified QR25DE 2.5L inline-four engine for Nissan Frontier (donor 2005)
- Compression tested, oil condition assessed, external components documented per unit
- Support for engine variant verification (QR25DE 2.5L I4 vs VQ40DE 4.0L V6)
- Cross-batch pair with our Nissan Frontier Transmission listing (RE5R05A automatic)
- Free shipping to all 50 states
- 15 day replacement warranty on component defects
- Support team familiar with Nissan Frontier lineage and QR engine family considerations
- Call (855) 634-4447 to confirm your Frontier year, engine variant, and transmission pairing before ordering.
15 Day Replacement Warranty
Every used Nissan Frontier Engine carries a 15 day replacement warranty starting on the delivery date. Engine variant verification (QR25DE 2.5L I4 - NOT VQ40DE 4.0L V6) is critical before ordering. Strict 5,000-mile oil changes required. Call (855) 634-4447 to start a warranty claim within 15 days of delivery.
What Is Covered
- Component defects present on arrival beyond what was disclosed
- Compression, oil, or major internal failures within 15 days from installation
- Engine assembly failures not disclosed at sale
- Incorrect part shipped due to an error on our end
What Is Not Covered
- Damage caused during installation
- Attempted installation as V6 replacement (NOT V6 compatible)
- Damage from missed oil change intervals or timing chain neglect
- Labor expenses of any kind, including engine swap labor
- Part: OEM used QR25DE 2.5L inline-four DOHC 16-valve engine
- Application: Nissan Frontier, QR25DE 2.5L I4 (donor 2005, D40 second-generation)
- Segment: Nissan mid-size pickup (I4 economy engine option)
- Engine Family: Nissan QR (QR20 2.0L, QR25 2.5L)
- CRITICAL: NOT the 4.0L VQ40DE V6 - I4 economy engine only
- Cross-Application: Also used in Altima, Rogue, Sentra, X-Trail across various generations
- Cross-Batch Pair: Nissan Frontier Transmission RE5R05A automatic (also in catalog)
- Timing Chain: Regular timing-chain checks recommended
Additional information
| Brand | Nissan |
|---|---|
| Bore x Stroke | 89 mm x 100 mm |
| Compression ratio | 9.5:1 to 10.5:1 |
| Displacement | 2.5L (2, 488 cc) |
| Fuel system | Multi-point EFI |
| Valvetrain | 16-valve with CVTC intake |
| Weight | About 330 lbs |
| Application | 2005 Nissan Frontier Engine |
| SKU | vaz712 |
| Price | $1, 999.00 |
An OEM used QR25DE 2.5L inline-four DOHC 16-valve engine assembly for Nissan Frontier applications (donor 2005 per the source data). The QR25DE 2.5L engine assembly as photographed. Function is providing economy motive power for Nissan Frontier mid-size pickup applications. Standard Nissan QR-family engine architecture with appropriate power / fuel economy characteristics for economy pickup applications.
No. Per the source data, this is the 2.5L four-cylinder, not the 4.0L V6 - does NOT replace the V6. Critical distinction - I4 and V6 Frontier applications are completely different engine platforms not cross-compatible. Second-generation Frontier was offered with two engine options: 4.0L VQ40DE V6 (higher-power) and 2.5L QR25DE I4 (this application, economy).
Nissan's 2.5L inline-four DOHC 16-valve engine variant used in Frontier I4 applications. Part of Nissan's QR engine family. QR family variants include QR20 (2.0L) and QR25 (2.5L - this application). Standard Nissan inline-four engine family used across various Nissan applications during the era. Established Nissan engineering with typical Nissan reliability characteristics.
The QR25DE engine variant is used across various Nissan applications including the Nissan Frontier (this application), Nissan Altima (various generation configurations), Nissan Rogue (various generation configurations), Nissan Sentra (various generation configurations), Nissan X-Trail (international markets), and various other Nissan applications. Widely deployed Nissan inline-four engine variant.
Yes. Cross-batch pair - this QR25DE engine listing pairs with our Nissan Frontier Transmission listing (RE5R05A automatic 5-speed, V6 or I4 compatible per that source data). Complete Frontier drivetrain sourcing available across our engine and transmission listings for Frontier applications. Call (855) 634-4447 for cross-listing verification.
Per the source data, strict 5,000-mile oil changes recommended. Various QR25DE variants have documented oil consumption concerns on higher-mileage applications - strict oil change frequency is important for long-term engine reliability. Standard Nissan practice for QR25DE oil change frequency compliance. Missed oil changes can affect warranty coverage.
Per the source data, regular timing-chain checks are recommended for long-term engine reliability. The QR25DE uses timing chain architecture (vs timing belt) - provides longer service life vs timing belt but requires various age-related service considerations. Various QR25DE timing chain guide wear concerns have been documented across higher-mileage applications.
Compression loss. Oil consumption (various QR25DE variants have documented oil consumption concerns on higher-mileage applications). Valvetrain wear. Timing chain guide wear. Various age-related component wear. Symptoms include engine performance loss, oil consumption, check engine codes, various powertrain integration issues. Strict oil change frequency helps mitigate wear concerns.
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