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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteOn May 28, 2024, Toyota, Subaru and Mazda announced a commitment to develop engines suited to electrification and carbon neutrality. The plan is not for one shared engine: each company will develop a design based on its own signature architecture, with the aim of integrating it more closely with electric-drive components and enabling compatibility with carbon-neutral fuels.
What did Toyota, Subaru and Mazda announce?
The companies said they would develop new engines designed to work alongside motors, batteries and other electric drive units. They also identified more compact packaging and compatibility with carbon-neutral fuels as development goals. The announcement describes a direction for engineering work, not a finished product or a complete vehicle powertrain. The companies’ joint announcement sets out the shared aims and the three distinct approaches.
Are they developing the same engine?
No. The companies said each would develop its own signature engine architecture. The announcement does not describe a common engine to be supplied across all three brands.
What engine is each company working on?
| Company | Announced architecture | Description in the announcement |
|---|---|---|
| Subaru | Horizontally opposed | The horizontally moving pistons are described as contributing to a low profile, reduced vibration and a lower center of gravity. |
| Toyota | Inline-four | Toyota characterizes the engine as capable of high output and high thermal efficiency; the release provides no comparative test data. |
| Mazda | Rotary | Mazda describes the rotary engine as compact, lightweight and powerful, and says it was then being used for generators. |
These are different layouts, not interchangeable versions of one design. The descriptions are qualitative; the announcement supplies no common measurements for comparing power, efficiency, emissions or cost. The release’s architecture descriptions do not include final specifications or comparative test results.
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Will the engines be hybrids, and what fuels could they use?
The companies said the engines should be optimized for integration with motors, batteries and other electric drive units. That points to electrified powertrains, but the release does not specify a complete configuration for any brand: it does not say whether a particular engine will be paired with a hybrid system, identify a vehicle, or describe the system’s components in detail.
The companies also named e-fuel, biofuels and liquid hydrogen as potential carbon-neutral fuels. In the release, “carbon-neutral” refers to net-zero CO2 emissions across a fuel’s lifecycle, from manufacture through use. That is the companies’ stated definition and development ambition—not evidence that these fuels are already lifecycle-neutral in practice or will be widely available. The joint release also links more compact engines with the possibility of lower vehicle hoods and improved packaging and aerodynamic options.
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When will the new engines be available?
The announcement gave no production date, named vehicle, final specifications, performance figures or prices. The Associated Press likewise reported on May 28, 2024, that the companies had not disclosed when the engines would reach the market. AP’s contemporaneous report provides that market-timing context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the companies said
The executives framed the commitment as part of their respective approaches to electrification and carbon neutrality. In the joint announcement dated May 28, 2024:
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- Subaru President and CEO Atsushi Osaki said, “As we continue to refine electrification technology, we will also enhance our horizontally-opposed engines with an aim to use carbon-neutral fuels in the future.”
- Toyota President and CEO Koji Sato said, “In order to provide our customers with diverse options to achieve carbon neutrality, it is necessary to take on the challenge of evolving engines that are in tune with the energy environment of the future.”
- Mazda President and CEO Masahiro Moro said, “We will continue to offer customers exciting cars by honing internal combustion engines for the electrification era and expanding the multi-pathway possibilities for achieving carbon neutrality.”
The announcement is therefore a commitment to pursue three distinct engine architectures for electrified applications—not a launch announcement or a promise that combustion engines will replace electric powertrains.
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