The 2025 Isuzu NPR has 26 engine parts with verified fitment on this page — 9 part types and 9 brands, covering both the 5.2L L4 DIESEL Turbocharged and the 6.6L V8. Each part includes a manufacturer part number and application notes.
The engine on the 2025 Isuzu NPR covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. The largest groups are Oil Filter (9 parts), Oil (5 parts) and Exhaust Valve (2 parts). The other 6 part types cover the remaining 10 parts.
The 2025 Isuzu NPR was sold with both the 5.2L L4 DIESEL Turbocharged and the 6.6L V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2025 Isuzu NPR engine parts are QUALCAST (10 parts), VALVOLINE (5 parts) and PUROLATOR (3 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Heavy Duty / Diesel.
2 parts on this 2025 Isuzu NPR page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including VARIOUS MFR PG2500 (Oil Filter) and WIX WL10255 (Oil Filter). Click any part number to see every vehicle that part fits.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ENGINE PRO Fits: 6.6L V8 | 2812688186 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
This group shows a single part: ENGINE PRO 2812688186.
Exhaust Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 1013122 | 🇺🇸 US 🇨🇦 CA | 1.456 Head DIA. 0.312 Stem. N-Series Trucks. (Mexico ELF 400-600). OEM # 8972098763 | View on Amazon |
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 1013464 | 🇺🇸 US 🇨🇦 CA | 1.456 Head DIA. 0.3120 Stem DIA. 5.520 OAL. OEM # 8981583761 | View on Amazon |
This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
QUALCAST supplies both parts for the 2025 Isuzu NPR.
Listed part numbers: QUALCAST 1013122 and QUALCAST 1013464.
Intake Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 1013121 | 🇺🇸 US 🇨🇦 CA | 1.457 Head DIA. 0.313 Stem. N-Series Trucks. (Mexico ELF 400-600). OEM # 8943958822 | View on Amazon |
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 1013463 | 🇺🇸 US 🇨🇦 CA | 1.457 Head DIA. 0.3130 Stem DIA. 5.530 OAL. OEM # 8980388700 | View on Amazon |
This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
QUALCAST supplies both parts for the 2025 Isuzu NPR.
Listed part numbers: QUALCAST 1013121 and QUALCAST 1013463.
Oil
Summary: Notes list SAE 10W-30 and SAE 15W-40. Confirm the engine and the weight on the filler cap before you buy. Replacement brands in this table include VALVOLINE.
Full Synthetic
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 5.2L L4 DIESEL Turbocharged | 909772 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Full Synthetic SAE 15W-40 DIESEL1 Gallon | View on Amazon |
Heavy Duty / Diesel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 5.2L L4 DIESEL Turbocharged | 909778 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Conventional SAE 15W-40 DIESEL1 Gallon | View on Amazon |
Synthetic Blend
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 5.2L L4 DIESEL Turbocharged | 909766 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 15W-40 DIESEL1 Gallon | View on Amazon |
| VALVOLINE Fits: 5.2L L4 DIESEL Turbocharged | 909776 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 10W-30 DIESEL1 Gallon | View on Amazon |
| VALVOLINE Fits: 5.2L L4 DIESEL Turbocharged | 909782 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Synthetic Blend SAE 15W-40 DIESEL2.5 Gallon | View on Amazon |
This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable.
VALVOLINE supplies the 5 Oil parts for the 2025 Isuzu NPR.
In the Full Synthetic grade, VALVOLINE supplies 1 part: full-synthetic oils. A representative part number is VALVOLINE 909772.
In the Heavy Duty / Diesel grade, VALVOLINE supplies 1 part: grouped under the catalog's "Heavy Duty / Diesel" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 909778.
In the Synthetic Blend grade, VALVOLINE supplies 3 parts: synthetic-blend oils. A representative part number is VALVOLINE 909766.
Part numbers include VALVOLINE 909772, VALVOLINE 909778 and VALVOLINE 909766, among others listed above.
Oil Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR Popular Fits: 6.6L V8 | PG2500 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ECOGARD Fits: 5.2L L4 DIESEL Turbocharged | X11646 | 🇺🇸 US 🇨🇦 CA | Fits Premium Oil FilterStandardor Premium Oil Filter or Standard | View on Amazon |
| PUROLATOR Fits: 6.6L V8 | TL22500 | 🇺🇸 US 🇨🇦 CA | Bypass Relief Valve Setting: 22 PSIMedia Material: Cellulose | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX Popular Fits: 6.6L V8 | WL10255 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| HASTINGS / BALDWIN Fits: 6.6L V8 | LF637 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VARIOUS MFR Fits: 6.6L V8 | PG2500EX | 🇺🇸 US 🇨🇦 CA | Extended Life | View on Amazon |
| WIX Fits: 5.2L L4 DIESEL Turbocharged | WL10316 | 🇺🇸 US 🇨🇦 CA | Fits or NPR-XD | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PUROLATOR Fits: 6.6L V8 | 2500BP | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| PUROLATOR Fits: 6.6L V8 | TL22500BP | 🇺🇸 US 🇨🇦 CA | Bypass Relief Valve Setting: 22 PSIMedia Material: Cellulose | View on Amazon |
This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive.
9 Oil Filter parts are listed for the 2025 Isuzu NPR, from PUROLATOR, VARIOUS MFR, WIX and 2 other brands. VARIOUS MFR PG2500 carries the "Popular" badge.
In the Economy grade, VARIOUS MFR, ECOGARD and PUROLATOR supply 3 parts: the catalog's value-priced group. A representative part number is VARIOUS MFR PG2500.
The Standard Replacement section lists 4 options from WIX, HASTINGS / BALDWIN and VARIOUS MFR — built to original-equipment specification. WIX WL10255 is listed in this group.
2 ungrouped parts are not assigned to a grade, with the same engine-level match.
Part numbers include VARIOUS MFR PG2500, ECOGARD X11646 and PUROLATOR TL22500, among others listed above.
Valve Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 6.6L V8 | VS50907R | 🇺🇸 US 🇨🇦 CA | Permadry RubberValve Cover Grommets Not Included | View on Amazon |
This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
One part is listed for the 2025 Isuzu NPR — FEL-PRO VS50907R.
Valve Guide
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 303297 | 🇺🇸 US 🇨🇦 CA | 2.245 OAL. 0.316 I.D. 0.553 O.D. OEM # 8973767191 | View on Amazon |
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 303101 | 🇺🇸 US 🇨🇦 CA | 2.245 OAL. 0.3150 I.D. 0.5526 O.D. OEM # 8943907800 | View on Amazon |
This table covers the pressed-in bronze and cast-iron guides that align valve stems. Typical signs include oil smoke on startup, a guide that has gone oval, or a valve that no longer seats quietly. Guides are a machine-shop fit. Confirm stem diameter in the notes before ordering.
QUALCAST supplies both parts for the 2025 Isuzu NPR.
This group includes QUALCAST 303297 and QUALCAST 303101.
Valve Seat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 2215021 | 🇺🇸 US 🇨🇦 CA | INSERT | View on Amazon |
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 2215022 | 🇺🇸 US 🇨🇦 CA | INSERT | View on Amazon |
This table covers the Valve seats.
2 Valve Seat parts for the 2025 Isuzu NPR come from QUALCAST.
Part numbers include QUALCAST 2215021 and QUALCAST 2215022.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 3896245 | 🇺🇸 US 🇨🇦 CA | Viton Ring and Spring | View on Amazon |
| QUALCAST Fits: 5.2L L4 DIESEL Turbocharged | 38700255 | 🇺🇸 US 🇨🇦 CA | Viton Metal Clad. OEM # 8973767200 | View on Amazon |
This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
QUALCAST supplies both parts for the 2025 Isuzu NPR.
Listed part numbers: QUALCAST 3896245 and QUALCAST 38700255.
Buying Engine Parts for a 2025 Isuzu NPR
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Match the engine first. Every engine part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Oil Filter and Oil .
Frequently Asked Questions
How many engine parts fit the 2025 Isuzu NPR?
Our catalog currently lists 26 engine parts for the 2025 Isuzu NPR across 9 subcategories and 9 brands, covering both the 5.2L L4 DIESEL Turbocharged and the 6.6L V8. Each part is matched to the engine(s) it fits.
Do engine parts differ between 2025 Isuzu NPR engines?
Yes. Every engine part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of engine problems on a 2025 Isuzu NPR?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What oil viscosity is listed for the 2025 Isuzu NPR?
Oil rows on this page include SAE 10W-30 and SAE 15W-40. Confirm the engine and the weight on the filler cap before you buy — high-mileage and standard fills can differ.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2025 Isuzu NPR was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2025 Isuzu NPR?
First match the engine — each row shows which engine(s) the part fits. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2025 Isuzu NPR
Engine Parts for Other Isuzu NPR Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.