2018 Isuzu NPR Oil Capacity & Filter
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The 2018 Isuzu NPR requires approximately 10 quarts (9.5 liters) of 15W-40 diesel engine oil that meets API CK-4 specifications.
Quick Answer
- Oil Capacity: 10 quarts / 9.5 liters (with filter)
- Recommended Oil Weight: 15W-40
- Oil Specification: API CK-4
- Oil Filter OEM Part Number: 5-87610019-0
- Aftermarket Oil Filter Cross-References: Fram PH3593A, WIX 51742, Mobil 1 M1-303A
Capacity by Engine Option
| Engine | Oil Capacity (with filter) |
|---|---|
| 4HK1-TC 5.2L I4 Turbo Diesel | 10 quarts / 9.5 liters |
Oil Change Interval
- Normal Duty: 10,000 miles or 12 months, whichever comes first.
- Severe Duty: 5,000 miles or 6 months. Severe duty includes frequent short trips, excessive idling, dusty conditions, and heavy towing.
Drain Plug Torque
- Drain Plug Torque: 30 ft-lbs (41 Nm). Always use a new crush washer to prevent leaks.
How to Change the Oil
- Warm up the engine to allow the oil to drain more easily.
- Place a drain pan under the oil pan and remove the drain plug.
- Allow the old oil to drain completely.
- Remove the old oil filter. Be prepared for some oil to spill.
- Wipe the filter mounting surface clean and apply a thin layer of new oil to the gasket of the new filter.
- Install the new filter and tighten it according to the manufacturer's instructions (usually hand-tight plus a quarter turn).
- Reinstall the drain plug with a new crush washer and torque it to 30 ft-lbs.
- Fill the engine with 10 quarts of new 15W-40 CK-4 diesel oil.
- Start the engine and let it run for a few minutes to circulate the new oil.
- Shut off the engine, wait a few minutes, and check the oil level, adding more if necessary.
Common Issues / Tips
- The 2018 Isuzu NPR is known for its robust 4HK1-TC engine. One common tip is to monitor the diesel particulate filter (DPF) system. A clogged DPF can lead to performance issues and engine damage. Regular highway driving is recommended to allow the DPF to regenerate.
- When changing the oil, pay close attention to the oil cooler lines. They can sometimes leak, and it's a good opportunity to inspect them.
- Given the commercial nature of these trucks, keeping a maintenance log is crucial for resale value and ensuring longevity. Documenting oil changes and other services is highly recommended.
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More specs for the 2018 Isuzu NPR
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Isuzu NPR Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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