Cummins’ first gasoline engine is the B6.7 Octane, a turbocharged 6.7-liter inline-six intended for medium-duty commercial trucks. Car and Driver reported launch ratings from 200 hp and 600 lb-ft to 300 hp and 660 lb-ft, using 87-octane gasoline; these are reported specifications, not independent test results.
“Gas” here means gasoline, not natural gas. Cummins already makes natural-gas engines, including the X15N, whose full production the company said began in fall 2024. The B6.7 Octane rollout was reported in March 2025 as an OEM-partner program, not a retail crate-engine launch.
What is the Cummins B6.7 Octane?
The B6.7 Octane is a gasoline-fueled, turbocharged 6.7-liter inline-six. Car and Driver reported that Cummins planned four output variants, ranging from 200 hp and 600 lb-ft to 300 hp and 660 lb-ft. The report also relayed a Cummins oil-change interval claim of 15,000 miles; actual service intervals depend on the application, so owners should follow the vehicle maker’s schedule.
| Reported specification or detail | Reported information |
|---|---|
| Engine | Cummins B6.7 Octane, turbocharged inline-six |
| Displacement and fuel | 6.7 liters; gasoline, reported as 87-octane |
| Output range | 200–300 hp and 600–660 lb-ft |
| Oil service interval | 15,000 miles, a manufacturer figure relayed by Car and Driver |
Specifications and service information above were reported by Car and Driver in 2025. They should not be read as independently verified test results or as one specification applying to every engine variant.
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Which trucks are expected to use it?
Launch coverage described the engine as intended for medium-duty commercial applications, including trucks and other work vehicles. Initial production was reported as limited to OEM chassis partners, with Kenworth named. Motor1, republished by inkl, reported planned Kenworth Class 5–7 applications. These are launch plans reported in March 2025; the available sources do not establish current model-year fitment or present-day availability.
Gasoline versus natural gas at Cummins
The phrase “first gas engine” refers to Cummins’ first gasoline engine, not its first engine using a gaseous fuel. Cummins’ 2025 SEC-filed materials state that full production of its X15N natural-gas engine began in fall 2024. The X15N and B6.7 Octane use different fuels and are distinct engine offerings.
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FAQ
Is the Cummins B6.7 Octane gasoline or diesel?
It is gasoline-fueled. Car and Driver reported that it runs on 87-octane gasoline.
How much horsepower and torque does the B6.7 Octane make?
Car and Driver reported four output variants spanning 200 hp and 600 lb-ft to 300 hp and 660 lb-ft. Those figures are launch specifications reported in 2025, not independent test results.
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Which trucks will get the Cummins B6.7 Octane?
Launch reports described medium-duty commercial trucks and named Kenworth as an initial chassis partner. Motor1, republished by inkl, reported planned Class 5–7 Kenworth applications. Confirm current fitment and availability with Cummins or the truck manufacturer.
Can consumers buy the B6.7 Octane as a crate engine?
The available launch coverage describes an OEM commercial powertrain rollout, not retail crate-engine access. It does not establish consumer retail availability.
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