Isuzu Commercial Truck Engines Overview

There are three Isuzu engines to explore when you visit our lot at Nimnicht Isuzu Trucks. The standard 6.6-liter gas engine provides plenty of power for the N-Series, keeping your speed responsive with 350 horsepower. Your options expand with the two diesel powertrains for the N-Series and F-Series, providing the extra torque required to make heavy-duty hauling trivial. Before you decide on the next member of your fleet, let's first review your three options.

Isuzu Truck Engines: Your Choice of Power

There are three Isuzu engines across the N-Series and F-Series lineup. They differ in Isuzu maintenance, power, and how often you need to refill.

N-Series Gas Powertrain

The standard Isuzu NPR, Isuzu NPR-HD, Isuzu NQR, and Isuzu NPR all use the Gen V GMPT L8T. This 6.6-liter V-8, paired with the 8L90 Hydra-Matic 8-speed automatic transmission or the Allison 1000 RDS 6-speed automatic, creates 350 horsepower and 425 pound-feet of torque.

Generally, you should select the gas engine if you want fuel efficiency over short distances, or a Class 3 Truck. The standard NPR is currently only available with a gas engine, so if you want an 18,000 GCWR work truck,¹ you'll be using the 6.6-liter powertrain. The gas powertrain can handle up to Class 5 trucks, meaning you can access up to 25,550 pounds of GCWR with regular fuel.¹ The 6.6-liter will also save you money per gallon compared to diesel and require slightly less maintenance, as the engine is a bit less complex. However, regular fuel doesn't last very long on country roads, so refueling will be more commonplace.

If you want even greater fuel efficiency, consider our all-electric N-Series powertrains. These models have less range than either gas or diesel models, but can save businesses that primarily operate within the same county thousands on refueling costs.

N-Series Diesel Powertrain

Isuzu diesel engines provide much more of a kick over gas-only models. Available for the Isuzu NPR-HD, Isuzu NPR-XD, Isuzu NRR Derate, and Isuzu NRR, the N-Series diesel engine is the 4HK1-TC, a 5.2-liter V-8 diesel powertrain. It creates 215 horsepower and a whopping 452 pound-feet of torque, and is always paired with the Aisin A465id 6-speed automatic transmission.

Diesel powertrains are typically our recommendation for anyone driving cross-country. Diesel fuel lasts longer, requiring fewer refills than its gas counterpart during longer drives. The extra torque simplifies hauling, too, making acceleration easier when you're all hitched up. Your diesel N-Series will be a Class 4 or 5 truck, with a GCWR between 20,500 and 25,500 pounds.¹ However, if you're not driving for long stretches, you may find that the diesel powertrain requires slightly more intensive maintenance.

F-Series Diesel Powertrain

If you want some of our largest, most capable commercial models, then you'll be equipped with a diesel powertrain. The F-Series includes the Isuzu FTR, Isuzu FVR Derate, and Isuzu FVR. These Class 6 and 7 trucks have a roaring Cummins® 6.7-liter diesel V-8 as their core, creating 260 horsepower and 660 pound-feet of torque, allowing you to have trucks with a GCWR between 30,000 and 33,000 pounds.¹ Thanks to the Allison 250 RDS 6-speed automatic (with park pawl on the FTR), your drive will be smooth.

The F-Series trucks are our largest models, making them crucial for businesses that often haul massive loads. The Cummins® brand is legendary for a reason: it is an exceptionally potent powertrain with plenty of hauling power, though if you don't need a truck with a GVWR of over 25,000 pounds,² you may want to consider an N-Series model instead.

Who Makes Isuzu Engines?

Now, you might be wondering about who the Isuzu engine manufacturer is. These work trucks are created under their parent company, Isuzu Motor Limited. This organization has a local wing in Plymouth, MI, where it oversees production lines nationwide. We get N-Series Diesel models imported through Tacoma, San Diego, Jacksonville, Baltimore, and Newark. N-Series Gas, N-Series EV, and F-Series trucks are assembled locally in Charlotte, MI, and a new production facility is opening in Greenville, SC, offering even more production for our partners nationwide.

Our myriad local facilities are part of the reason why Isuzu vehicle maintenance is so accessible. Despite being work trucks with diesel engines, our licensed service center is well-stocked with materials to perform any aspect of service, from the recommended fluids in our Isuzu engine oil guide to more intensive upkeep like belt replacement or spark plug changes. Isuzu engine reliability and manufacturer trustworthiness are both a priority, which is why we're happy to partner with the growing network of local Isuzu brand factories across America.

Experience the Isuzu Engine Specs at Nimnicht Isuzu Trucks

Are you ready to benefit from these locally-built engines and factory-sourced components? At Nimnicht Isuzu Trucks, you'll meet a team that's knowledgeable about the new members of your fleet. If you're thinking about a gas or diesel N-Series but unsure whether you need an F-Series for capacity, our team can help you explore body lengths and applications.

Learn more about the Isuzu brand to see how else we strive to elevate your worksite.

Frequently Asked Questions

Who makes engines for Isuzu trucks?

The engines are constructed by Isuzu Motors Limited, a Japanese construction company based in Plymouth, MI. They have factories worldwide, from the United States to Japan, enabling locally sourced production of engines built with exquisite care. Isuzu Motors Limited also signs deals with specific brands, such as Cummins®, for its commercial products.

Where are Isuzu engines made?

Isuzu engines are built in factories across the globe. Most American powertrains are developed in Charlotte, MI, with parts distribution centers in California, Ohio, and Pennsylvania. A brand-new production facility in Greenville, SC, is expected to build N-Series Gas and F-Series models by 2027.

Are Isuzu engines reliable?

Yes, Isuzu engines are well known for being reliable. The 4JJ1 engine is especially notable for its incredible quality, as it's proven itself over two decades and is still used in work trucks to this day. Nearly all diesel powertrains built for Isuzu are rated for 300,000 to 500,000 miles, promising to serve you well for decades.

Do Isuzu engines require special maintenance?

Gas and diesel Isuzu engines do require special care to maintain their performance, but you can expect a process similar to that of many work trucks. As expected of hard-working powertrains, you will need to bring them in for service at common intervals: typically at 7,500-mile intervals for oil replacement and inspections.