2024 Isuzu NQR Oil Capacity & Filter Guide

The 2024 Isuzu NQR takes either 14.8 quarts (14.0 liters) of 15W-40 heavy-duty diesel engine oil for the 5.2L turbodiesel engine, or 8.0 quarts (7.6 liters) of 5W-30 motor oil if equipped with the 6.6L V8 gas engine. As an ASE-certified master technician, I know that keeping these commercial workhorses properly lubricated is the single most important factor in minimizing fleet downtime and avoiding catastrophic engine failures.

Below is your complete quick-reference guide to oil capacities, oil specifications, filter cross-references, and torque specs for the 2024 Isuzu NQR.

Quick answer

For the 5.2L 4HK1-TC Turbodiesel Engine:

• Oil Capacity: 14.8 quarts (14.0 L) with filter change.
• Recommended Weight: 15W-40 (or 5W-40 full synthetic for extreme cold climates below 0°F).
• Oil Specification: API CK-4 (Low Ash) to protect the DPF system.
• Oil Filter (OEM): Isuzu 8-97371-334-0
• Oil Filter (Aftermarket): Wix 57074, Fram PH8690 (Always consult your dealer to ensure exact fitment for the 2024 model year).

For the 6.6L V8 Gas Engine:

• Oil Capacity: 8.0 quarts (7.6 L) with filter change.
• Recommended Weight: 5W-30.
• Oil Specification: API SP / ILSAC GF-6A / dexos1 Gen3.
• Oil Filter (OEM): ACDelco PF63 (GM/Isuzu OEM)
• Oil Filter (Aftermarket): Wix WL10390, Fram PH10060, Mobil 1 M1-113A.

Capacity by engine option

Depending on how your chassis cab was upfitted and ordered, you will have one of two very different powerplants. Always verify your engine before buying fluids.

Oil change interval

Commercial trucks live hard lives, so maintenance schedules are often based on mileage, engine hours, or fuel consumption.

• Normal Duty: For highway driving and light P&D (Pickup and Delivery) work, the 5.2L diesel can go up to 10,000 miles (or 500 engine hours), while the 6.6L gas engine can safely reach 7,500 miles.
• Severe Duty: For extreme idling, heavy towing, PTO usage, or frequent stop-and-go city driving, cut the intervals in half. Change the diesel engine oil every 5,000 miles (or 250 engine hours) and the gas engine oil every 4,000 to 5,000 miles.

Drain plug torque

• 5.2L Diesel: 30 lb-ft (40 Nm).
• 6.6L Gas: 18 lb-ft (25 Nm).
• Crush Washer Note: The NQR oil pan utilizes a drain plug gasket (crush washer). You must replace this copper or aluminum washer at every oil change to prevent leaks. Do not overtighten the plug, especially on the gas engine's cast oil pan.

How to change the oil

1. Warm the Engine: Bring the engine up to operating temperature, then shut it off. This helps suspend soot (in diesels) and ensures faster draining.
2. Drain the Oil: Place a high-capacity drain pan (at least 5-gallon capacity for the diesel) under the oil pan. Remove the drain plug and let it drain completely.
3. Replace the Filter: Using a filter wrench, remove the spin-on oil filter. Clean the engine mating surface. Pre-fill the new filter with fresh oil (essential for the diesel to prevent dry-start wear), lubricate the rubber O-ring with fresh oil, and hand-tighten.
4. Reinstall Plug: Install the drain plug with a new crush washer and torque to specification.
5. Refill and Check: Fill the engine with the specified amount of oil. Start the engine, check for leaks at the filter and plug, and shut it off. Wait 5 minutes, then pull the dipstick to verify the level is at the "FULL" mark.
6. Reset Monitor: Reset the dash maintenance monitor or update your fleet management software.

Common issues / tips

For the 2024 NQR generation, keep these specific tips in mind:

• Diesel Fuel Dilution: If you notice the oil level on the 5.2L dipstick is rising or smells strongly of diesel, you may be experiencing fuel dilution due to incomplete DPF regenerations. Have the truck scanned and serviced immediately.
• Grease the Chassis: Don't just change the oil! The NQR has multiple grease zerks on the kingpins, tie rod ends, and driveline U-joints. A proper PM (Preventative Maintenance) service includes greasing these at every oil change.
• Gas Engine Dipstick Tube: The long dipstick tube on the cab-over V8 gas model can make checking the oil a bit cumbersome. Always insert the dipstick slowly to prevent it from binding.

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