10 OVERBUILT JAPANESE ENGINES Designed To Last 1,000,000 MILES!

Added: 2026-05-23

[00:00:04][music] >> A taxi driver in Nairobi has used the same engine since 1987. No rebuilds, no major repairs, just oil changes, a timing chain at 300,000 mi and 38 years of daily driving. When the odometer broke, he just kept going. The engine is a Toyota 22R-E, a 2.4 [clears throat] L four-cylinder that made 116 horsepower at [music] its best. It's not fast or fancy, just incredibly reliable. 10 Japanese engineers built 10 engines just like it. Each one shared the same quiet goal, to make something that would never stop working.

[00:00:39]Number 10, Honda B18.

[00:00:43]A 1994 Honda Integra sits in a garage in São Paulo, Brazil with 1.1 million km on its original engine. The owner, Carlos, is a retired mechanic who has never opened the engine block. He's replaced the clutch four times, changed the timing belt every 100,000 km, and swapped the water pump twice. The engine itself has never needed work. It still has good compression on all four cylinders and starts right up every morning. That engine is the Honda B18, a 1.8 L inline-four that Honda made from 1989 to 2001. On paper, it seems pretty ordinary, 140 horsepower, basic fuel injection, and a standard valve train.

[00:01:23]Nothing that would worry an engineer at Ferrari, but Honda built the B18 with extremely [music] tight tolerances, more like something you'd find in a lab than in a regular car. The cylinder walls were finished to such precise standards that most other car makers thought it was overkill for a street engine. The crankshaft was balanced better than needed. The head gasket was made of layered steel, while most competitors still used composite gaskets that would eventually leak coolant and cause slow engine failure. In the late 1980s, Honda engineers followed a principle called zero-defect thinking. Instead of trying to catch problems before the car left the factory, they aimed to design engines so problems couldn't happen at all. The B18 showed this approach perfectly. Engineers spent months looking at common engine failures like heat cycling, oil starvation, and detonation, then made each part strong enough that only serious neglect could cause it to fail. The result was an engine that became popular with tuners for good reason. They found the B18 could handle much more power than it was rated for. What they were really seeing was Honda's built-in safety margin. The engine wasn't just made for 140 horsepower. It could handle 240 without trouble, but Honda tuned it lower because that's all the car needed. Every part had extra strength. Today, it's common to find B18 powered [music] Integras with 400,000 mi. Owners who bought them for $2,000 often list them on Craigslist, but many just won't let them go.

[00:02:46]Number nine, Nissan VG30. Nissan introduced the Patrol Y60 to the Australian mining industry. The conditions were extraordinary 50° heat, unpaved tracks, payloads that exceeded what the truck was rated for, and maintenance schedules that existed mostly on paper. Within 5 years, fleet managers in the Pilbara region of Western Australia had documented something that opposed expectation. The VG30 engines in those Patrols were not wearing out on schedule. They were barely wearing anything at all. The VG30 is a 3.0 L V6 that Nissan first made for the 1980 Cedric sedan and later used in everything from the Patrol to the 300ZX.

[00:03:24]It was never Nissan's most powerful or lightest engine, but it was built so tough that only years of hard use revealed [music] its true strength.

[00:03:32]Nissan chose a cast iron block when other companies were switching to aluminum to save weight. This hurt them in road tests and fuel economy ratings, but it gave them something more important, thermal stability under heavy use. Cast iron handles temperature changes more predictably than aluminum.

[00:03:48]In a desert mine running hard for 12 hour shifts, that reliability meant the engine lasted much longer. The oil passages were wider than necessary. The main bear The oil passages were bigger than needed. The main bearing journals were larger than the engine's power required. The timing chain, not a belt, ran through pressurized oil and was built to handle much more force than the engine would ever produce. Nissan engineers seemed to design the VG30 for the toughest conditions, then sent it to the Australian Outback, where those conditions were common. [music] There are reports of VG30 engines running past 800,000 km without bottom end work.

[00:04:22]Several [music] reached a million. One fleet manager described the experience simply, "We stopped expecting them to fail."

[00:04:29]Number eight, Subaru EJ.

[00:04:32]In 1989, a Subaru engineer named Takashi Hasegawa made a decision that most of his peers considered excessive. He specified that the EJ engine cylinder liners, the sleeves inside the block that the pistons actually travel through, would be iron pressed into an aluminum block rather than the aluminum bore that was becoming standard in the industry. It added weight. It added cost. It added complexity to the manufacturing process. This choice also meant the EJ engine would still have good cylinder bores at 300,000 mi, while aluminum bore engines from the same time would have been retired long before. The EJ is the engine that powered almost every Subaru sold between 1989 and 2011.

[00:05:11]The 2.0 and 2.5 L versions went into the Impreza, the Legacy, the Forester, and the Outback. It became so ubiquitous in certain parts of the world, rural Japan, the American Pacific Northwest, the Canadian Rockies, that mechanics learned to rebuild it the way previous generations had learned to rebuild tractor engines, intimately, instinctively. What made the EJ special wasn't just one part, but the overall design philosophy. The horizontally opposed or boxer layout lowered the center of gravity and reduced vibration.

[00:05:41]It also spread heat more evenly, so no single area got too hot. The oil pump was larger than needed and the water jacket was deep and well designed. In higher spec versions, the bottom end had forged connecting [music] rods parts you'd expect in a rally car, not a family wagon. In rural Hokkaido, where winters are harsh and garages are unheated, EJ engines that only ever had oil changes were taken apart at 400,000 km. Mechanics found the main bearings still within factory specs [music] and Hasegawa's iron liners were still perfectly round. What seemed like overkill in 1989 turned out to be smart engineering by 2010.

[00:06:18]Number seven, Mazda B-series.

[00:06:21]There is an argument to be made that the Mazda B-series engine, the simple, unremarkable, utterly dependable inline-four that powered Mazda trucks [music] and the Ford Courier from the early 1970s through the mid-1990s is the least celebrated great engine ever built. No one writes magazine features about it. No one builds shrines to it.

[00:06:40]It never powered a car that won a race or broke a record. It just refused to quit quietly for 25 years on every continent. By the time it reached its final form as the 2.2 L B2200, it had grown in displacement but never strayed from its original operating principle of simplicity as a survival strategy.

[00:06:58]Single overhead cam, two valves per cylinder, cast iron block and head, no variable timing, no turbocharger, no electronics beyond a basic ignition system. Mazda engineers knew something that's often forgotten today. Every extra part in an engine is another thing that can break. The B-series had fewer parts to fail than most engines of its time. It used a carburetor for fuel delivery, simple by today's standards, but easy to fix with a cheap kit and a few hours. The ignition was mechanical and the cooling system was straightforward. There was nothing fancy about it and that was the whole idea. In Southeast Asia, B-series Mazda trucks became essential for small farms and transport businesses. Stories of these engines running over 500,000 mi with just oil changes and [music] carburetor rebuilds are so common in Thailand and the Philippines that they're hardly even noticed. That's just what these engines do.

[00:07:48]Number six, Toyota 1HZ. [music] In 1990, Toyota introduced an engine so simple that automotive journalists weren't sure what to think.

[00:07:58]The 1HZ was a 4.2 L naturally aspirated diesel inline six. No turbocharger, no intercooler, just 96 horsepower. It took about 17 seconds to reach 60 [music] mph, slower than a loaded moving truck.

[00:08:12]Toyota knew this and didn't mind. That's because the 1HZ wasn't made for speed.

[00:08:17]It was made for the United Nations.

[00:08:18]Specifically, it was built for the Land Cruiser 70 series, which the UN and dozens of international aid organizations had designated as their primary vehicle for operations in sub-Saharan Africa, Central Asia, and the Middle East. These were places where the nearest Toyota dealer was potentially 1,000 mi away, where fuel quality was unpredictable, where maintenance meant whatever a local mechanic with basic [music] tools could manage, where a broken vehicle didn't mean a call to roadside assistance. It meant people didn't get food, medicine, or evacuation. Toyota over-engineered the 1HZ for these tough conditions with almost obsessive attention. The compression ratio was kept low to reduce stress on the pistons and rings. The injection pump was a mechanical Bosch unit with no electronics, so any diesel mechanic could fix [music] it with basic tools. The cooling system was built to handle full throttle use in 45° heat.

[00:09:09]The timing chain was made strong enough for twice the load the engine would ever see. It was an engine that UN fleet managers described as essentially maintenance-free beyond fluid changes.

[00:09:19]Aid organizations in Tanzania documented 1HZ engines running past 600,000 km with no major work. In one case, a Land Cruiser in a remote region of Mali had its 1HZ running for seven consecutive years with no oil changes. The fleet operator had simply run out of oil, and the nearest resupply was too far. The engine survived. It was damaged, but it survived. A standard engine under those conditions would have seized within weeks. Toyota [music] still makes the 1HZ today with almost no changes from its 1990 design. That's not just nostalgia, it's because the market has shown that nothing newer has earned the right to replace it.

[00:09:57]Number five, Nissan TD42.

[00:10:02]Ask any long-haul trucker in the Middle East which engine they trust most, [music] and many will answer right away, the Nissan TD42. It's a 4.2 L inline six diesel that Nissan started making in 1987, and in some places it's still used in new vehicles. Not because Nissan can't make something newer, but because customers won't accept anything else.

[00:10:21]Nissan designed the TD42 with a simple philosophy, make it simple, make it strong, and make it easy to fix anywhere. The block was thick cast iron, making catastrophic failure under normal use nearly impossible. Crankshaft was forged steel and balanced so well it ran as smoothly as engines that cost twice as much. The injection system was fully mechanical with no electronics. That might have seemed outdated in 1987, but in a remote desert in 2003, [music] it meant the difference between getting home and being stranded. What set the TD42 apart from other tough engines was its cooling system. Nissan engineers studied how diesel engines fail in extreme heat and found that thermal management was the main problem. So, they built the TD42's cooling system as if it would always run at full load in 50° heat. Because in places like Kuwait, Saudi Arabia, and the Australian Outback, it often did. The radiator was oversized, the oil cooler came standard, and the water pump moved more fluid than usual to keep hot spots in the engine constantly cooled. Fleet operators in the Gulf states recorded [music] TD42 engines passing 700,000 km in daily use.

[00:11:29]In Australia, mining companies using Patrol GUs with TD42's found that the only part needing regular attention was the glow plugs. The engine itself just kept running. It worked in extreme heat on poor quality fuel with overdue air filters, low coolant, and worn belts. It kept going because Nissan built in enough margin that even running poorly was still safe for the TD42.

[00:11:53]Number four, Toyota 22RE.

[00:11:57]The story of the 22RE begins, like many great engineering stories, with a failure. In the late 1970's, Toyota's truck engines were known for being reliable, but not for the legendary reliability that would later define the brand. Mechanics knew the weak spots, head gasket problems at high mileage, and timing chain stretch around 200,000 mi in hard use trucks. Toyota's engineers were aware of these issues, too. Introduced in 1985, the 22RE was Toyota's answer to every failure they had seen in earlier engines. The head gasket was redesigned with multiple layers of steel to stop coolant leaks.

[00:12:32]The timing chain was made longer and stronger, running through an oil bath to keep it lubricated even during cold starts, when most wear happens. The fuel injection system was Toyota's own EFI design, simpler and tougher than what competitors offered at the time. The result was an engine so reliable that it was almost impossible to break through normal use. Toyota engineers had eliminated every known failure point, and even the one they didn't expect, owner neglect, didn't matter much. There are 22RE engines that have run over 300,000 mi with irregular oil changes.

[00:13:04]It's not recommended, but the engine can handle it. Most people remember the Top Gear test. Jeremy Clarkson's team bought a 1988 Toyota pickup, drove it into the ocean, set it on fire, dropped it from a crane, and put it on top of a building they later demolished. After each test, they got it running again with just basic tools and parts. The 22RE never quit, but the real proof isn't a TV stunt. It's that 22RE trucks from the mid-1980s now sell for more than their original price, adjusted for inflation.

[00:13:34]Owners know what they have and don't want to let them go. Remember the Nairobi taxi driver from earlier? His engine is a 22RE.

[00:13:42]It's still running.

[00:13:44]Number three, Honda K series.

[00:13:48]In 2001, Honda retired the B18 and replaced it with the K series. The automotive press received this news with moderate interest. Fleet operators and taxi companies in East Asia received it with the specific kind of reserved optimism reserved for the moment when something already excellent might be about to get better, and it did get better. The K series, specifically the K20 and K24 variants, took everything Honda had learned from 15 years of building the B18 and applied it with the advantage of better materials, better manufacturing technology, and a decade of field data about exactly where engines fail and why. The cylinder head was redesigned with larger ports and improved combustion chamber geometry.

[00:14:28]The variable valve timing system, Honda's own i-VTEC, was implemented with a reliability that variable valve timing systems from other manufacturers wouldn't match for years. The oil passages were revised to ensure complete lubrication of critical components within seconds of a cold start, the moment when most of the engine's lifetime wear actually occurs. But the main philosophy stayed the same as with the B18, designed for the worst-case, build the engine to handle twice the stress it will ever face and don't leave any weak spots. [music] In Taiwan and South Korea, K24-powered Honda CRVs became the standard choice for taxi operators within 3 years of launch, not because of any marketing campaign, but because word had spread from mechanics who tore down high-mileage examples and found internals that looked like they'd done half the work they had. A K24 with 400,000 km on it in the hands of a taxi company that serviced it properly looked inside like a K24 with 150,000.

[00:15:24]The wear patterns were there under close inspection, but nothing that suggested the engine was finished. Nothing that suggested it was even tiring. [music] Documented million kilometer K series engines exist in commercial fleets across Asia, Australia, and South America. Not as curiosities, as working vehicles that haven't been retired yet because there are K series engines with over a million kilometers in commercial fleets across Asia, Australia, and South America. They aren't just rare examples.

[00:15:52]They're still working because there's no mechanical reason to retire them. Were overbuilt so far beyond what their intended applications required that enthusiasts decades later are still discovering the limits. The 1JZ was the 2.5 L version. The 2JZ was the 3.0. Both were inline sixes with cast iron blocks, forged steel crankshafts, and a bottom end architecture that Toyota's engineers had dimensioned for sustained high rpm operation in the Mark II and the Supra.

[00:16:20]They were relatively conservative performers. The 2JZ in standard form made 220 horsepower, respectable but not extraordinary for a 3.0 L engine in 1992. At launch, few people outside Toyota's engineering team realized how much the engine could handle. The 2JZ's iron block was much thicker than needed for its power. The crankshaft used racing grade steel and the connecting rods were sized for loads the engine would never see in stock form. Toyota seemed to build this engine for power levels that didn't even exist yet. Just in case they might be needed someday.

[00:16:53]The tuning community discovered what Toyota had really built around 1995 when modified 2JZs started making 500, 600, even 700 horsepower levels that should have destroyed them, but the engines handled it. Today, a 2JZ powered car has gone over 230 mph at the Bonneville Salt Flats using an engine design that's more than 30 years old. It's about taxi fleets in Thailand and the Philippines that ran 1JZ-powered Crown sedans for 20 years and 800,000 km, then sold them still running to someone else who used them for another decade. It's about JDM Supras in Japan with odometers showing over a million kilometers, cared for by owners who treat the engine with the respect it deserves.

[00:17:36]Number one, Toyota 22R.

[00:17:39]Before the 22RE, there was the 22R. If the 22RE was Toyota's perfected version of a great engine, the 22R introduced in 1981 was the first real proof that such reliability was possible. The 22R was a 2.4 L carbureted inline-four. Carbureted in 1981 was not unusual. What was unusual was the depth of engineering Toyota had put into every component of an engine that would, on the surface, appear completely ordinary. The block was cast iron with a generous water jacket that kept operating temperature stable across a wider range of conditions than the thermostat would normally allow. The cylinder head was designed with combustion chambers that promoted complete mixing of fuel and air without requiring high compression, which meant the engine ran cleanly on low-grade fuel and survived detonation events that would crack the pistons of a more highly stressed design. The valve train used a single overhead cam and was extremely simple. It had mechanical tappets, no hydraulic lifters to fail, no complicated adjustments to wear out, just metal parts set precisely, needing a valve adjustment every 100,000 mi.

[00:18:45]That small bit of maintenance gave decades of smooth running. The timing chain had two rows of links instead of one, and the tensioner kept it tight from cold start to full temperature for the engine's entire life. Toyota made the 22R for 14 years, from 1981 to 1995, with only small changes. It powered Hilux pickups, Land Cruisers, the 4Runner, and the Celica. It was sold in Australia, Africa, South America, Southeast Asia, and the US. And everywhere it earned the same reputation. It just kept working. In Australia, Hilux trucks with 22R engines became the backbone of Outback farms in a way no later Toyota engine has matched. Mechanics in Queensland and Western Australia who worked on these trucks in the 1980s and 1990s had a saying that became a local legend. A Hilux dies when the body rusts off, the engine's still going. That wasn't an exaggeration, it was just the truth.

[00:19:39]There's a 1983 Toyota Hilux in Australia's Northern Territory that has worked on a farm since it was new. The body has been repaired many times, the cab replaced, and the tray rebuilt. The engine has only needed two timing chain replacements and regular oil changes.

[00:19:54]The odometer stopped at 987,000 km in 2019, but the truck is still running.

[00:20:00]The owner thinks it will have passed a million kilometers by 2021. And he doesn't plan to stop driving it anytime soon.