The 6th gen 4Runner, spanning model years 2010 to 2023, represents a significant evolution for Toyota’s rugged body-on-frame SUV. At the heart of this generation lies a powertrain lineup defined by reliability, off-road capability, and a gradual shift toward more refined technology. Understanding the 6th gen 4Runner engine options is crucial for anyone considering a purchase of this used icon, as each configuration offers a distinct blend of power, efficiency, and purpose.
4.0-Liter V6: The Workhorse Heart
The most iconic and enduring engine in the 6th generation 4Runner is the 4.0-liter 1GR-FE V6. This robust powerplant was carried over from the 5th generation and remained largely unchanged throughout the 2010-2023 production run. Producing 270 horsepower and 278 lb-ft of torque, the 1GR-FE delivers smooth power delivery that is perfectly suited for both highway cruising and demanding off-road excursions. Its iron block and aluminum heads contribute to a reputation for durability that has become synonymous with the 4Runner name, making it a top choice for buyers prioritizing longevity over peak performance.
Fuel Economy and Towing Capacity
While not class-leading, the 4.0-liter V6 provides a reasonable balance of capability and efficiency. EPA-estimated fuel economy typically falls in the low 16 MPGs city and high 19 MPGs highway for rear-wheel-drive models, with slightly lower figures for four-wheel-drive variants. This engine mated seamlessly to a robust five-speed automatic transmission, shrouding the cabin from harsh vibrations even under heavy load. When it comes to practicality, the 4.0L 4Runner boasts a maximum towing capacity of 5,000 pounds, confidently handling trailers, boats, and campers without breaking a sweat.
The Introduction of a Diesel: The 2KD-FTV
For the 2015 model year, Toyota expanded the 6th gen 4Runner lineup by introducing a diesel option for the first time in the United States. This milestone was marked by the inclusion of the 2KD-FTV 4.0-liter turbocharged diesel engine, sourced from Toyota’s international markets. The diesel offered a compelling alternative, focusing on low-end torque and exceptional fuel efficiency rather than raw horsepower. Rated at 160 horsepower and 302 lb-ft of torque, the diesel engine provided a remarkable towing experience with a capacity of up to 5,000 pounds while significantly improving fuel economy.
Efficiency and the Trade-offs
The primary allure of the diesel variant was its outstanding fuel economy, with EPA estimates reaching the high 20s MPG highway. This made the 4Runner surprisingly practical for long-distance travel and daily commuting. However, this came with trade-offs; the diesel engine lacked the high-RPM punch of the gasoline V6, resulting in a noisier cabin and a more industrial feel under hard acceleration. Additionally, the complexity of the diesel particulate filter and urea injection system introduced potential maintenance concerns that buyers of the standard gasoline models did not face.
Performance Dynamics and Drivetrain Synergy
Regardless of the powertrain chosen, the 6th generation 4Runner retained its body-on-frame construction and robust off-road hardware. The engine power is transmitted to the wheels via a part-time four-wheel-drive system with a multi-speed transfer case. This setup allows drivers to switch between 2WD and 4WD modes, optimizing traction and fuel efficiency. The crawl control and multi-terrain select features, available on higher trims, work in harmony with the engine and transmission to manage throttle and braking automatically, making challenging trails accessible to drivers of all skill levels.
