Nissan Frontier 2.5L Engine Specs: Horsepower, Torque & MPG

Introduction to the Nissan Frontier’s 2.5L Engine

The Nissan Frontier has long been a reliable midsize truck, and its 2.5-liter four-cylinder engine has been a key option for drivers seeking a balance of efficiency and capability. While newer models have shifted toward more powerful V6 and turbocharged engines, nissan frontier 2.5l engine variant remains a topic of interest for budget-conscious buyers and those prioritizing fuel economy. This engine, often found in earlier Frontier models (particularly the 1998-2004 first-generation trucks), delivers a modest but dependable performance suitable for daily driving and light hauling. In this article, we’ll break down its horsepower, torque, fuel efficiency, and overall reliability to help you decide if this engine fits your needs.

Horsepower and Torque Output

The Nissan Frontier’s 2.5L four-cylinder engine (officially designated as the KA24DE) produces 154 horsepower at 5,600 RPM and 160 lb-ft of torque at 4,000 RPM. These figures were competitive for its time, offering enough power for city commuting and light towing (up to 3,500 lbs when properly equipped). While it won’t win any drag races, the naturally aspirated engine is known for its smooth power delivery and durability. Compared to modern turbocharged four-cylinders, the KA24DE lacks low-end torque, meaning it requires higher revs to access peak power. However, its simple design and lack of forced induction contribute to its long-term reliability, making it a favorite among those who prioritize low maintenance costs over raw performance.

Fuel Economy and Efficiency

One of the biggest selling points of the 2.5L Frontier is its fuel efficiency—at least by truck standards. EPA estimates for this engine (depending on the model year and drivetrain) average around:

• 19-20 MPG city

• 23-24 MPG highway

• 21 MPG combined

These numbers make it one of the more economical options in the midsize truck segment, especially when compared to V6-powered rivals of the same era. The engine’s efficiency comes from its relatively lightweight design and optimized fuel injection system. However, real-world mileage can vary based on driving habits, payload, and whether the truck is equipped with 4WD (which slightly reduces MPG). For buyers looking for a frugal workhorse, the 2.5L Frontier remains a solid choice.

Reliability and Common Issues

The KA24DE engine has earned a reputation for being one of Nissan’s most reliable powerplants, with many examples surpassing 200,000 miles with proper maintenance. Its cast-iron block and aluminum head provide durability, while its straightforward design makes repairs easier than modern turbocharged engines. However, no engine is perfect, and the 2.5L Frontier has a few known issues:

• Timing chain tensioner wear (can cause rattling if not replaced)

• Oil leaks (common around valve cover gaskets)

• Exhaust manifold cracks (due to heat cycling over time)

Routine oil changes, timely belt replacements, and addressing minor leaks early can keep this engine running smoothly for years. Many owners report that the 2.5L is significantly more reliable than the later 4.0L V6, which had more complex components.

Is the 2.5L Frontier Still a Good Buy Today?

While newer Frontiers offer more power and technology, the 2.5L model remains a practical choice for certain buyers. Its low ownership costs, decent fuel economy, and proven reliability make it ideal for:

• Commuter trucks (for those who need a bed but don’t tow often)

• First-time truck owners (simple mechanics mean lower repair bills)

• Budget-conscious used buyers (early 2000s models are affordable)

However, if you frequently tow or need more acceleration, the 4.0L V6 or a newer turbocharged engine would be a better fit. Ultimately, the 2.5L Frontier excels as a no-frills, economical work truck—one that won’t let you down as long as you maintain it properly.

Final Verdict

The Nissan nissan frontier 2.5l engine may not be the most powerful, but it offers a winning combination of reliability, efficiency, and affordability. If you’re shopping for a used midsize truck and prioritize longevity over performance, this engine is worth serious consideration. For those needing more capability, stepping up to a V6 or a newer Frontier model might be the better route. Either way, the 2.5L KA24DE remains a testament to Nissan’s engineering in the early 2000s—simple, tough, and built to last.