2018 Dodge Durango SRT Horsepower: Complete Engine Specs and Performance Guide

The 2018 Dodge Durango SRT delivers a formidable 475 horsepower and 470 lb-ft of torque from its naturally aspirated 6.4-liter HEMI V8 engine. This massive output allows the three-row SUV to accelerate from 0 to 60 mph in just 4.4 seconds, solidified by a certified quarter-mile time of 12.9 seconds.

As we look back from 2026, the 2018 Dodge Durango SRT remains a significant milestone in the evolution of American performance SUVs. It was the moment Dodge successfully integrated the "392" HEMI V8—previously reserved for the Challenger and Charger—into a family-sized vehicle capable of towing 8,700 pounds. To understand the impact of this vehicle, one must look beyond the raw numbers and examine how that horsepower is generated, managed, and translated into real-world performance.

The Heart of the Beast: The 392 HEMI V8 Engine

The primary source of the 2018 Durango SRT’s power is the 6.4-liter (392 cubic inch) HEMI V8. In an era where many manufacturers were already downsizing to turbocharged V6 engines, Dodge doubled down on displacement. This engine is a masterpiece of traditional American engineering, utilizing a deep-skirt iron block and aluminum alloy heads with the iconic hemispherical combustion chambers.

The 475 horsepower peaks at 6,000 RPM, while the 470 lb-ft of torque arrives at 4,300 RPM. This power curve is characteristic of a large-displacement, naturally aspirated engine; it provides a linear and predictable surge of acceleration that forced-induction engines often struggle to replicate.

Engineering Details of the 6.4L HEMI

The 392 HEMI features a bore of 103.9 mm and a stroke of 94.6 mm, creating a high-torque profile ideal for moving a vehicle with a curb weight of approximately 5,510 pounds. It utilizes a 10.9:1 compression ratio, which necessitates the use of premium (91 octane or higher) unleaded fuel to achieve the rated horsepower figures and prevent engine knock under high load.

One of the more sophisticated features of this engine is the Fuel Saver Technology (Multi-Displacement System, or MDS). Under light load conditions, such as highway cruising, the engine can seamlessly deactivate four of the eight cylinders to improve fuel efficiency. While "efficiency" is a relative term for a 475-hp SUV, this technology allows the Durango SRT to maintain a modicum of practicality for long-distance travel.

Putting Power to the Pavement: The Drivetrain

Horsepower is meaningless if the vehicle cannot maintain traction. To manage the 475 hp, Dodge equipped the 2018 Durango SRT with a sophisticated performance-tuned All-Wheel Drive (AWD) system and a heavy-duty transmission.

TorqueFlite 8-Speed Automatic

The engine is mated to the TorqueFlite 8HP70 eight-speed automatic transmission. This gearbox is widely regarded as one of the best in the industry, offering rapid-fire shifts (as fast as 160 milliseconds in Track mode) and the durability to handle the HEMI's torque. The transmission features rev-matching downshifts, ensuring the vehicle stays within its power band during aggressive driving.

Quadra-Trac Active On-Demand AWD

The AWD system in the 2018 Durango SRT is not designed for off-roading; it is designed for maximum grip and launch performance. It utilizes an active transfer case and a rear electronic limited-slip differential (ELSD). The system varies the torque split based on the selected Drive Mode:

• Auto Mode: 40% front / 60% rear torque split for everyday balance.
• Sport Mode: 35% front / 65% rear, tightening the suspension and sharpening shifts.
• Track Mode: 30% front / 70% rear, delivering a more rear-biased feel for better corner exit speeds.
• Tow Mode: 50% front / 50% rear for maximum stability while pulling heavy loads.
• Snow and Eco Modes: Adjust the power delivery to 50/50 or optimized fuel mapping respectively.

Performance Metrics: Beyond the 0-60 MPH

While the 4.4-second 0-60 mph time is the headline-grabbing figure, the 2018 Durango SRT's performance is comprehensive. Its quarter-mile time of 12.9 seconds was certified by the National Hot Rod Association (NHRA), a rarity for a production SUV at the time.

Braking and Handling

To control the momentum generated by 475 hp, the Durango SRT utilizes a high-performance braking system developed by Brembo. It features six-piston calipers in the front and four-piston calipers in the rear, clamping down on vented rotors (15 inches front, 13.8 inches rear). This setup allows the heavy SUV to come to a full stop from 60 mph in just 115 feet.

The handling is further enhanced by a Bilstein adaptive damping suspension. This system monitors road conditions and driver inputs hundreds of times per second, adjusting the firmness of the shocks to minimize body roll in corners while maintaining a composed ride on the highway.

Technical Specifications Comparison

When comparing the 2018 Durango SRT to its peers and internal stablemates from the same era, the positioning of its horsepower becomes clear.

While the BMW X5 M offered more raw power and faster acceleration, the Durango SRT provided a unique value proposition: the ability to carry six passengers and tow significantly more weight, all while maintaining a competitive sub-5-second 0-60 time.

Towing with 475 Horsepower

One of the primary reasons buyers chose the Durango SRT over the Jeep Grand Cherokee SRT was the utility. The Durango features a longer wheelbase (119.8 inches versus 114.7 inches), which provides greater stability when towing.

The 475 hp and 470 lb-ft of torque are instrumental in its 8,700-pound towing capacity. Most high-performance SUVs sacrifice utility for speed, but the Durango SRT's cooling system, transmission calibration, and AWD logic were specifically engineered to handle heavy trailers. In "Tow Mode," the Bilstein dampers adjust to manage the extra tongue weight, and the active noise cancellation system helps mask the engine drone that can occur when the V8 is under sustained load.

Maintenance and Longevity: A 2026 Perspective

In 2026, many 2018 Durango SRTs have surpassed the 80,000 or even 100,000-mile mark. The 6.4L HEMI is generally considered a robust engine, but maintaining those 475 horses requires diligent care.

Common Maintenance Considerations

• Oil Requirements: The 6.4L HEMI requires 0W-40 full synthetic oil. Using a lower grade can interfere with the MDS (cylinder deactivation) system and lead to premature lifter wear.
• Spark Plugs: This engine uses two spark plugs per cylinder (16 total). Dodge recommends replacement every 60,000 to 100,000 miles, depending on driving habits.
• Brembo Brake Costs: Because the SRT uses high-performance Brembo components, brake pad and rotor replacements are significantly more expensive than those for a standard Durango. Owners should budget for high-quality replacements to maintain the 115-foot stopping distance.
• Drivetrain Fluids: Given the high torque loads, regular changes of the transfer case fluid and differential gear oil are critical for preventing AWD system failures.

Tuning and Increasing Horsepower

For enthusiasts who find 475 hp insufficient, the 2018 Durango SRT offers a respectable platform for modifications. However, the 6.4L HEMI has thinner cylinder walls compared to the 5.7L version, meaning it is less tolerant of high-boost forced induction without internal upgrades.

Common Performance Upgrades:

1. Cold Air Intakes: While the factory SRT hood is functional, aftermarket intakes can slightly improve throttle response and engine sound.
2. Exhaust Systems: Many owners opt for cat-back exhaust systems to amplify the signature HEMI "growl."
3. PCM Tuning: Unlocking the Powertrain Control Module (PCM) allows for custom tuning of fuel and timing maps. This can often net an additional 20-30 hp on an otherwise stock engine.
4. Supercharger Kits: Manufacturers like ProCharger and Whipple offer bolt-on kits that can push the 392 HEMI beyond 650 hp, though this often requires "drop-in" forged pistons and rods to ensure long-term reliability.

Is the 2018 Durango SRT Still Relevant?

In the current landscape of 2026, where electric SUVs offer instant torque and massive horsepower, the 2018 Durango SRT holds its value as a "purist" performance machine. It represents the pinnacle of naturally aspirated V8 utility. It doesn't rely on batteries or turbochargers to deliver its power; it relies on displacement and mechanical grit.

For those looking for a used performance vehicle, the 2018 model is often the "sweet spot." It was the first year of the SRT trim for the Durango, meaning it received the most aggressive styling, including the functional heat-extractor hood and the specialized AWD tuning, without the extreme price premiums seen on the later Hellcat versions.

Frequently Asked Questions

Does the 2018 Durango SRT require premium gas?

Yes, the 6.4-liter HEMI V8 is calibrated for 91 octane premium fuel. While the engine's computer can retard timing to accommodate lower octane fuel in an emergency, doing so will result in reduced horsepower, decreased fuel economy, and potential long-term engine damage if done under heavy load or high temperatures.

How does the 2018 Durango SRT horsepower compare to the Hellcat?

The 2018 SRT produces 475 hp. The Durango SRT Hellcat (introduced later) uses a supercharged 6.2-liter V8 that produces 710 hp. While the Hellcat is significantly faster (0-60 in 3.5 seconds), the 2018 392 SRT is often praised for being more manageable as a daily driver and significantly more affordable on the used market.

Is the 2018 Dodge Durango SRT good for towing?

Absolutely. With its 475 hp and specialized "Tow Mode" in the AWD system, it has a class-leading towing capacity of 8,700 pounds. This makes it one of the few vehicles that can legitimately serve as both a track-day toy and a heavy-duty boat or horse trailer hauler.

What is the real-world fuel economy of a 475-hp Durango?

The EPA rated the 2018 Durango SRT at 13 mpg city, 19 mpg highway, and 15 mpg combined. In real-world 2026 driving conditions, owners typically report 12-14 mpg in mixed use. Frequent use of the 475 hp will, naturally, drive these numbers lower.

Are there common engine problems with the 6.4L HEMI?

The "HEMI tick" is a common concern among owners, often attributed to lifter or camshaft wear, which can be exacerbated by infrequent oil changes or using the wrong oil weight. However, when maintained properly with the recommended 0W-40 synthetic oil, the engine is known for its durability.

Final Recommendation for Buyers

If you are evaluating a 2018 Dodge Durango SRT in the current market, prioritize vehicles with a verifiable service history. The 475 horsepower is only as good as the maintenance behind it. Look specifically for evidence of regular oil changes and check the condition of the Brembo brake rotors, as these are high-cost wear items. The 2018 Durango SRT remains one of the most versatile performance vehicles ever built, offering a rare combination of raw V8 power, three-row seating, and heavy-duty towing capability that remains competitive even by 2026 standards.