Toughest engines are known for extreme durability and high power potential, often featuring robust designs like cast-iron blocks, forged internals, and simple engineering, with legendary examples including the Toyota 2JZ-GTE (handling massive tuning), Honda K-Series (bulletproof construction), GM LS V8s (versatile and reliable), and Cummins diesels (heavy-duty longevity). These engines survive extreme conditions, massive power upgrades, and hundreds of thousands of miles, showcasing over-engineering for reliability.
Here's a detailed look at ten of the most durable automobile engines ever built, and what makes them stand out.
The Wärtsilä-Sulzer RTA96-C turbocharged two-stroke diesel engine is the world's largest and most powerful production internal combustion engine. It has a maximum output of 84.42 MW (113,000 hp) of power and a displacement of 1,820 litres (110,195 cubic inches).
The BMW straight-six engines, like the old M54 or N52-those things are legends. Smooth, reliable, and surprisingly tough, as long as they've not been neglected. We've had customers drive them way past 150,000 miles and they're still going strong. You find one that's been well-looked after, and you're laughing.
10 highest horsepower cars in the world
Here are 10 of the most reliable car engines ever made—renowned across continents for lasting power, ease of maintenance, and minimal failures.
Vehicles with a V8 tend to have more horsepower than vehicles with a V6, although this varies depending on the components of the engine. V8 engines generally have more torque although, the difference can be minimal in some models. The power of eight cylinders allows for heavier hauls and higher towing capacity.
The "holy grail" of diesel engines typically refers to the Cummins 5.9L 12-valve (6BT) for its legendary reliability, mechanical simplicity (P7100 pump), and immense performance potential, making it iconic in the truck world, while modern contenders for a "holy grail" include the LBZ Duramax for its power and pre-emissions design, and innovative clean diesel tech from companies like Bosch.
According to a recent study by Consumer Reports, Toyota and Lexus were the most reliable vehicles in 2022. After Japanese cars, BMW was ranked third, while Mercedes' reliability was rated the lowest.
If you prioritize fuel economy and don't need a lot of power, then the four-cylinder is likely your best bet; while some V6 options get decent gas mileage, they are still less efficient overall than a four-cylinder engine. On the other hand, if you care about speed and power, then you'll want to go with the V6.
These Are the Absolute Worst Engines Ever Thrown Under a Hood
Yes, cars can have 5,000 horsepower, primarily in extreme custom builds for drag racing (like Tom Bailey's Camaro or Cleetus McFarland's "Eagle") or in conceptual hypercars (like the Devel Sixteen), often using massive V16 engines with multiple turbochargers; while achievable on a dyno, making such power reliable for street use or a full production car is incredibly difficult, requiring extreme engineering.
In computer chess, a chess engine is a computer program that analyzes chess or chess variant positions, and generates a move or list of moves that it regards as strongest. A chess engine is usually a back end with a command-line interface with no graphics or windowing.
Mercedes-Benz V8 (M113 Series)
The M113 V8 engine, starting with a 4.3-liter version in 1997, doesn't get the credit it deserves. It's a relatively simple aluminum block unit that tends to age out rather than suffer a catastrophic failure and has proved itself reliable.
It's become second nature to say the most reliable cars on the market come from Japan and to a lesser extent, South Korea. That might be true, but U.S. brands know how to build advanced, efficient, high-performing engines that last ages.
There isn't one single "number 1" reliable car, as rankings vary, but Toyota and its luxury brand Lexus, along with Honda and Subaru, consistently rank at or near the top for overall brand reliability in studies from sources like Consumer Reports and What Car?. Specific models frequently cited for exceptional longevity and low running costs include the Toyota Corolla and Toyota Camry, known for being nearly "bulletproof" for daily driving.
Top 10 Most Unreliable Car Engines (Avoid These!)
The best second-hand cars are consistently reliable brands like Toyota, Honda, and Mazda, with popular models including the Toyota Corolla, Honda Civic/Jazz, and Mazda3/CX-5, known for durability and low running costs, though a specific choice depends on your needs (e.g., small hatch, family SUV, sedan), budget, and desired features like fuel efficiency (Corolla Hybrid) or SUV practicality (CX-5).
Consumer Reports recently released its latest rankings of the most reliable car brands, with Lexus, Toyota, Mazda, Acura and Honda topping the list. Mechanics say those brands are often easier to maintain and tend to have fewer long-term issues.
What Are the 5 Best Diesel Truck Engines?
Simple Yet Robust By Design
Cummins engines are renowned for their longevity, which is made possible because of their simple yet robust design. Gas-powered internal combustion engines have many moving parts, but that complexity makes them more prone to failure and significantly more complicated to repair.
Diesel #1 is also known as winter diesel because it performs better than Diesel #2 in cold temperatures. It has a lower viscosity and is not prone to gel in freezing temperatures. Most stations offer a premium Diesel mix that is blended for local weather conditions. Diesel #2 costs less at the pump.
Simply put, a V6 is a 6-cylinder engine. Whereas, a V8 means an 8-cylinder engine. But, you may wonder what the 'V' means in V6 and V8. The 'V' represents the way cylinders are arranged in your engine. V-type engines have cylinders placed in a V-like shape, or to put it the other way, in two equal rows.
Cons of a turbocharged engine
Affordability: Cars with turbocharged engines are typically more expensive than vehicles with standard engines because may need to use premium gas in your car. Reliability: Turbocharged engines may not be as reliable as standard engines. Engines with more parts have more that can go wrong.
Turbo V6 pickups deliver better fuel economy than naturally aspirated V8s. Turbocharged engines lose about half as much power as you go up in altitude. Turbo engines are MUCH more tuner-friendly, you can gain 100 hp for less than $1000.