Car enthusiasts may enjoy tinkering with their engines, but most drivers see their vehicles as essential appliances for daily transportation. For them, reliability is crucial. While reliable cars have been widely discussed, it is equally important to highlight the most reliable engines ever made. These engines have powered numerous models and proven their endurance over time.
It is worth noting that while some engines were reliable, they were sometimes placed in less dependable vehicles. Additionally, proper maintenance plays a vital role in ensuring an engine’s longevity. Here, we explore ten of the most reliable engines ever created, ordered from oldest to newest based on their first use in a production vehicle.
1. Chrysler Slant-Six/G-Engine (1959–2000)
A reliable engine that is widely used across multiple models holds a special place in automotive history. The Chrysler Slant-Six, produced for over 41 years, powered 31 different models, including the Dodge Dart, Aspen, Challenger, and Charger, as well as Ram Vans and Pickups. Its distinctive 30-degree canted inline-six design provided exceptional durability and flexibility.
Available in three primary displacements (170, 198, and 225 cubic inches), the engine featured variations in block height, main bearings, and other structural elements.
Despite these differences, the Slant-Six maintained its reputation for reliability, whether constructed from cast iron or aluminum. The engine’s rigid design, effective cooling, and adaptability made it a favorite for both daily drivers and motorsport applications.
2. Ford 300 Straight-6 (1964–1996)
Ford’s 300 cubic-inch inline-six was an engineering marvel. First introduced in the 1965 F-Series pickup, this motor evolved over time, receiving fuel injection in the late 1980s and producing up to 150 hp. Built for workhorse duty, it powered trucks, tractors, ski lifts, and industrial equipment.
Known for its bulletproof design, the Ford 300 was often neglected yet continued to perform. The engine gained legendary status due to its ability to withstand abuse, including operating with low oil levels and minimal maintenance. Even after production ended in the U.S. in 1996, it continued in use worldwide and remains a staple among restorers and enthusiasts.
3. Mercedes-Benz OM617 (1974–1991)
The Mercedes-Benz OM617, a five-cylinder diesel engine, was legendary for its longevity. Taxi drivers in Germany often logged over 600,000 miles without opening the engine. The cast iron block, single overhead camshaft, and simple yet efficient design contributed to its durability.
The OM617’s naturally aspirated version produced 79 hp, while the turbocharged variant reached up to 227 hp, even setting speed records in the C111-II concept car. It powered the world’s first turbodiesel production sedan, the W116 300SD, and reinforced Mercedes-Benz’s reputation for reliability in the 1980s.
4. Toyota 1/2/3UZ-FE (1989–2013)
Toyota’s UZ-series V8 engines set the standard for reliability. First introduced in the Lexus LS 400, these 90-degree V8s were used across Toyota’s lineup, including luxury sedans, SUVs, and trucks.
With displacements of 4.0, 4.3, and 4.7 liters, these engines were known for their under-stressed design, smooth operation, and impressive durability. The UZ series was even adapted for marine and aviation applications, proving its robustness in diverse environments. Tuners and racers have pushed these engines beyond their factory specifications with great success.
5. BMW M50 (1990–1996)
BMW’s inline-six engines have long been praised for their smooth power delivery and reliability, and the M50 is no exception. Introduced in the E34 5 Series, it featured displacements of 2.0 and 2.5 liters and was BMW’s first engine with VANOS variable valve timing.
The M50’s cast iron block made it ideal for turbocharging, and its mechanical design inspired several subsequent BMW engines. Even in high-performance applications such as the M3’s S50 variant, the M50 remained reliable under extreme conditions.
Also Read: 10 Car Engines That Are Known for Longevity and Proven Reliability Over Time
6. Toyota 1JZ/2JZ (1990–2007)
Toyota’s JZ-series engines became icons in both stock and modified forms. The 2JZ, in particular, gained fame in the fourth-generation Supra for its ability to handle immense power modifications. With a cast iron block and an aluminum head, the 2JZ could reliably produce over 1,000 hp when modified.
The 1JZ, a smaller 2.5-liter version, also proved highly durable and tunable. These engines cemented Toyota’s reputation for reliability while offering immense performance potential.
7. Volkswagen ABF (1992–1999)
The Volkswagen ABF engine, a 2.0-liter, 16-valve inline-four, was a hidden gem. Found in the Mk III Golf GTI and fourth-generation Passat, it delivered 148 hp and loved high-revving applications.
Despite its short production span, the ABF became a favorite among enthusiasts for its durability. With a cast iron block and an aluminum head, it easily surpassed 250,000 miles. While certain sensors occasionally failed, the core engine remained exceptionally reliable.
8. GM LS V8 (1997–Present)
General Motors’ LS-series small-block V8s have defined reliability in modern American engines. First introduced in 1997, the LS family has been used in everything from trucks to performance cars like the Camaro and Corvette.
The LS engines feature a simple yet robust pushrod design, making them easy to modify and maintain. With displacements ranging from 4.8 to 7.4 liters and power outputs from 255 to 755 hp, these engines have proven themselves in endurance racing and daily driving alike.
9. Honda K-Series (2001–Present)
Honda’s K-series four-cylinder engines exemplify efficiency and reliability. Launched in 2001, they ranged from 2.0 to 2.4 liters and powered numerous Honda models, including the Civic Type R, Integra, and Accord.
With dual overhead cams, VTEC, and a high-revving nature, the K-series became a favorite for performance tuning. These engines have a reputation for handling extreme modifications while remaining durable, making them one of Honda’s most beloved powerplants.
10. Toyota 2GR (2005–Present)
Toyota’s 2GR, a 3.5-liter V6, has been a cornerstone of reliability in various Toyota and Lexus models, from the Tacoma to the Camry. This aluminum-block engine balances power and efficiency, producing between 237 and 316 hp.
Renowned for its durability, the 2GR has even powered the Lotus Evora and race cars. Toyota’s meticulous engineering ensures this engine continues to be one of the most dependable V6s in modern automotive history.
The engines on this list have earned their reputations through decades of performance and resilience. Whether powering workhorses, luxury sedans, or high-performance sports cars, they have proven that reliability is just as crucial as power and efficiency.
Proper maintenance remains essential, but these engines demonstrate that with solid engineering, a well-built motor can stand the test of time. For those seeking a dependable engine, these ten options remain some of the best choices in automotive history.
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