2019 Isuzu NPR Oil Capacity & Filter Reference

The 2019 Isuzu NPR requires approximately 10.6 quarts (10.0 liters) of 10W-30 CK-4 diesel engine oil. For a complete oil and filter change, it's wise to have 11 quarts on hand to ensure a full refill after draining and filter replacement.

Quick Answer

• Oil Capacity: 10.6 quarts / 10.0 liters (with filter)
• Recommended Oil Weight: 10W-30
• Oil Specification: API Service CK-4
• Oil Filter OEM Part Number: Isuzu 8-98165-071-0
• Aftermarket Oil Filter Cross-References:
  • Wix: 57731
  • Fram: PH10951
  • Mobil 1: Consult dealer/manufacturer

Capacity by Engine Option

The 2019 Isuzu NPR-HD, NPR-XD, and NQR models are typically equipped with the Isuzu 4HK1-TC 5.2L turbocharged four-cylinder diesel engine. Unlike many light-duty trucks with multiple gasoline and diesel options, the engine offering for this commercial class is standardized.

Oil Change Interval

For commercial vehicles like the Isuzu NPR, the oil change interval is dictated more by mileage and engine hours than time. Always default to the maintenance schedule in your owner's manual, but general guidelines are as follows:

• Normal Duty: Every 10,000 miles (16,000 km) or 350 engine hours. Normal duty assumes highway driving with sustained speeds and minimal idling or stop-and-go traffic.
• Severe Duty: Every 7,500 miles (12,000 km) or 250 engine hours. Severe duty includes frequent short trips, extensive idling (as with PTO use), operating in dusty or dirty environments, or heavy city stop-and-go driving. Most NPRs fall under the severe duty category.

Drain Plug Torque

Properly tightening the drain plug is critical to prevent leaks or damage to the oil pan.

• Drain Plug Torque: 30 lb-ft (41 N·m)
• Crush Washer: It is highly recommended to replace the drain plug gasket (crush washer) with each oil change to ensure a proper seal. The part number can vary, so consult your Isuzu dealer for the correct gasket.

How to Change the Oil (Simplified)

Changing the oil on an NPR is straightforward for those with heavy truck experience.

1. Warm the Engine: Run the engine for a few minutes to warm the oil, which helps it drain completely.
2. Position and Secure: Park on a level surface and engage the parking brake. Chock the wheels for safety.
3. Drain the Oil: Place a large drain pan (at least 12-quart capacity) under the oil pan. Remove the drain plug and allow the oil to drain fully.
4. Replace the Filter: The oil filter is typically located on the driver's side of the engine. Use a filter wrench to remove it. Be prepared for some oil spillage.
5. Install New Filter: Lightly lubricate the gasket of the new filter with fresh engine oil. Screw the new filter on by hand until it makes contact, then tighten it an additional three-quarters to one full turn.
6. Reinstall Drain Plug: Clean the drain plug and surrounding area. Install a new crush washer and tighten the drain plug to 30 lb-ft.
7. Refill with Oil: Add approximately 10 quarts of 10W-30 CK-4 oil through the fill cap on the valve cover. Wait a few minutes, then check the dipstick. Add the remaining oil slowly until the level is at the "Full" mark. Do not overfill.
8. Final Check: Start the engine and let it run for a minute, checking for leaks around the drain plug and filter. Shut off the engine, wait a few minutes, and re-check the dipstick, topping off if necessary.

Common Issues / Tips

• Dipstick Accuracy: Some owners report that the dipstick can be hard to read or may give slightly different readings. For the most accurate fill, rely on the specified capacity and verify with the dipstick after the oil has settled.
• Filter Access: Access to the oil filter is generally good, but it can be messy. Placing a rag or basin below the filter before removal can help catch drips.
• Oil Specification Matters: Using the correct API CK-4 rated oil is crucial for the health of the engine and its complex emissions systems, including the Diesel Particulate Filter (DPF). Using an incorrect oil type can lead to premature wear and costly repairs.
• Check for Fuel Dilution: On engines that undergo frequent DPF regeneration cycles, it's possible for diesel fuel to dilute the engine oil. When checking your oil, smell it for a strong diesel fuel odor, which could indicate a problem requiring professional diagnosis.

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