2019 Isuzu NQR Oil Capacity, Filter & Specs

The 2019 Isuzu NQR equipped with the 5.2L 4HK1-TC turbo diesel engine takes 14.8 quarts (14.0 liters) of engine oil, including the oil filter replacement. As a heavy-duty commercial cab-over truck, keeping up with the exact oil specifications and capacities is critical to maintaining the longevity and reliability of your fleet.

Below is a comprehensive guide to the oil capacity, filter part numbers, and maintenance specs for the 2019 Isuzu NQR.

Quick Answer

• Oil Capacity: 14.8 quarts (14.0 L) with oil filter change.
• Recommended Weight: 15W-40 for standard operating conditions (above 0°F) or 5W-40 full synthetic for extreme cold climates.
• Oil Specification: API CK-4 (Low Ash) to protect the Diesel Particulate Filter (DPF). API CJ-4 is also acceptable.
• OEM Oil Filter Part Number: Isuzu 8973713340 (or 8-97371-334-0).
• Popular Aftermarket Filters: WIX 57522, Baldwin B7298. (Consult your dealer or parts supplier for Mobil 1 or Fram heavy-duty cross-references, as standard passenger car filters do not apply).

Capacity by Engine Option

For the 2019 model year, the Isuzu NQR is powered exclusively by the robust 5.2-liter inline-4 turbo diesel engine.

Note: Always verify the oil level on the dipstick after a refill. Commercial truck pans can occasionally vary slightly based on specific upfitter configurations or PTO setups.

Oil Change Interval

Commercial trucks experience significantly different duty cycles than passenger vehicles. Isuzu bases maintenance intervals on miles, months, or engine hours—whichever comes first.

• Normal Duty: Every 10,000 miles, 12 months, or 300 engine hours. This applies to highway driving with moderate, consistent loads.
• Severe Duty: Every 5,000 miles, 6 months, or 150 engine hours. You must follow the severe duty schedule if the truck is used for extensive idling, short delivery routes, dusty environments, or frequent heavy towing/hauling.

Drain Plug Torque

• Drain Plug Torque: 32 lb-ft (43 Nm).
• Crush Washer: The 2019 Isuzu NQR uses a copper crush washer on the drain plug. It is highly recommended to replace this washer at every oil change to prevent slow leaks under pressure. Never over-tighten the plug, as stripping the heavy-duty oil pan threads is an expensive mistake.

How to Change the Oil

Performing an oil change on a cab-over Isuzu NQR is relatively straightforward due to excellent ground clearance.

1. Prepare the Truck: Park on a level surface, set the parking brake, and ensure the engine is warm but not dangerously hot.
2. Drain the Oil: Place a large drain pan (at least 5 gallons / 20 quarts capacity) under the oil pan. Remove the drain plug and let the oil drain completely.
3. Replace the Filter: Locate the spin-on oil filter. Use a heavy-duty filter wrench to remove it. Lubricate the rubber gasket of the new filter with fresh oil, thread it on by hand until it makes contact, and then tighten it an additional 3/4 to 1 full turn.
4. Reinstall Drain Plug: Fit a new crush washer to the drain plug and torque it to 32 lb-ft.
5. Tilt the Cab & Fill: Unlatch and securely tilt the cab to access the engine oil fill cap. Pour in 14.5 quarts of the specified API CK-4 oil.
6. Check Level: Start the engine, let it idle for a few minutes to fill the filter, and check for leaks. Shut off the engine, wait 5 minutes, and check the dipstick. Top off the remaining oil until it reaches the "FULL" mark.

Common Issues & Tips

• Use Low-Ash Oil: You must use API CK-4 (or CJ-4) oil. Older diesel oil specs (like CI-4) have high ash content that will quickly clog the Diesel Particulate Filter (DPF), leading to expensive emissions system failures and forced regenerations.
• Fuel Dilution: Because these trucks often undergo active DPF regeneration, a small amount of diesel fuel can wash past the piston rings into the crankcase. If you notice the oil level is higher on the dipstick than when you filled it, or it smells strongly of diesel fuel, you may have fuel dilution. Adhere strictly to the severe-duty interval if your truck idles heavily.
• Grease the Chassis: Don't just change the oil! A standard commercial PM (Preventative Maintenance) service requires greasing the kingpins, tie rods, u-joints, and slip yokes at every oil change interval.

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