Decades of automotive engineering have produced legendary gasoline engines that defy expectations, outlasting trends and proving their worth in the harshest conditions. Some were built for endurance, others for precision, but all have earned a reputation for reliability that keeps them running. For enthusiasts and experts alike, here are the 10 most reliable gasoline engines ever built.

Toyota 22RE

Toyota engineered the 22RE with durability as its cornerstone. This 2.4L inline-four, housed within Toyota pickups and 4Runners, benefits from a cast-iron block and electronic fuel injection, ensuring resilience in demanding conditions. Whether navigating rugged trails or enduring high-mileage commutes, this engine maintains steady performance.

Honda K-Series

Efficiency and innovation define Honda’s K-Series engines, a marvel of engineering that pairs performance with longevity. Featuring DOHC VTEC, lightweight aluminum construction, and a high-revving nature, these powerplants energize everything from Civics to Acuras. Their precise fuel delivery and optimized internal components minimize wear, contributing to their reputation for sustained reliability.

Ford 300 Inline-Six

Built with a focus on unyielding torque and steadfast reliability, Ford’s 300 cubic-inch inline-six established itself as the backbone of F-Series trucks. Its simplicity—featuring forged internals and a low-stress design—allows it to endure extreme workloads without faltering. Designed for hauling and towing, this engine thrives where brute strength is paramount.

Chevrolet Small Block 350

Adaptability is the hallmark of Chevy’s 350 small block, a powerplant celebrated across muscle cars and trucks. The engine’s versatile cast-iron foundation and easily serviceable components make it a favorite for performance enthusiasts and restorers alike. With an aftermarket network supporting upgrades and modifications, it remains a cornerstone of American automotive culture.

Toyota 2JZ-GTE

Precision engineering meets raw power in Toyota’s 2JZ-GTE. Designed with forged internals, closed-deck architecture, and turbocharging, this engine handles extreme boost levels with ease and stays reliable. Enthusiasts admire how it balances strength with refined performance, cementing its reputation as an iconic performance powerhouse.

Mitsubishi 4G63

The 4G63 engine is legendary for its turbocharged performance. Found in the Lancer Evolution and other Mitsubishi models, this inline-four features forged internals, a strong iron block, and advanced turbocharging. It’s a favorite among enthusiasts and tuners because of its ability to handle extreme power levels while maintaining reliability.

Subaru EJ22

With its boxer configuration and sturdy closed-deck block, Subaru’s EJ22 is proof of simplicity. This non-interference engine provides owners with a forgiving design that prevents severe damage in the event of a timing belt failure. Its well-balanced structure reduces vibration and contributes to the smooth driving experience Subaru fans appreciate.

BMW M50

The M50 engine marked BMW’s transition to modern performance-oriented inline-sixes. Featuring an iron-block foundation, dual overhead cams, and a free-revving nature, it delivers power smoothly across the RPM range in E34 and E36 models. Engineered for consistency, it remains popular among enthusiasts restoring older BMWs.

Chrysler Slant-Six

The Chrysler Slant-Six is a workhorse designed for effortless operation. This tilted inline-six not only improved coolant circulation but also minimized engine wear by reducing stress on key components. Found in Dodge and Plymouth vehicles, it thrived in both everyday commuting and heavy-duty applications, reinforcing Chrysler’s reputation for reliability.

Nissan RB26DETT

Few engines command as much respect as Nissan’s RB26DETT, the heart of the Skyline GT-R. Designed for performance under extreme conditions, this twin-turbocharged inline-six has a closed-deck design and reinforced internals, ensuring stability under high boost levels. Tuners continue to choose it as a top choice due to its exceptional longevity.