There is no single evidence-based “best” six-cylinder engine in this shortlist: the right choice depends on whether you want a sports-car powertrain or an SUV engine for everyday family use. Three manufacturer-documented 2021 examples show that range: BMW’s B58 inline-six in the M440i xDrive, Toyota’s inline-six in the GR Supra 3.0, and Honda’s V6 in the Pilot. Their published specifications are useful for comparison, but they are not results from a common test or a ranking of every engine on sale.
How to judge a six-cylinder engine
“Best” depends on the vehicle’s job. For a performance coupe or sports car, output, torque delivery and the manufacturer’s stated acceleration are relevant. For a family SUV, the engine’s role in a larger vehicle and its listed fuel-management technology matter too. Configuration and displacement help describe what is being compared, but do not establish which engine is more reliable, economical or enjoyable to own.
The examples below are limited to U.S. specifications for the 2021 BMW 4 Series and Honda Pilot, plus Toyota Canada’s 2021 GR Supra specifications. The published acceleration figures use different units and are not presented as a controlled head-to-head test. The figures are manufacturer-published specifications, not independent comparative results.
Three notable six-cylinder engines for 2021
| Engine and vehicle | Configuration and output | Vehicle performance or technology | Why it belongs on this shortlist |
|---|---|---|---|
| BMW B58 2021 BMW M440i xDrive, U.S. |
3.0-liter turbocharged inline-six; 382 hp at 5,800–6,500 rpm and 369 lb-ft at 1,800–5,000 rpm, according to BMW. | BMW states 0–60 mph in 4.3 seconds for the M440i xDrive. | A performance-oriented inline-six with detailed published power and torque ranges. BMW’s 2021 4 Series specifications. |
| Toyota GR Supra 3.0 inline-six 2021 GR Supra 3.0, Toyota Canada specifications |
3.0-liter turbocharged inline-six; 382 hp at 5,800–6,500 rpm and 368 lb-ft at 1,800–5,000 rpm, according to Toyota Canada. | Toyota Canada states 0–96 km/h in 3.9 seconds. For 2021, Toyota described exhaust-manifold and piston changes and chassis recalibration. | A sports-car example with the same headline horsepower rating as the BMW entry, but a different vehicle and market source. Toyota Canada’s 2021 GR Supra announcement. |
| Honda Pilot V6 2021 Pilot, U.S. trims listed by Honda |
3,471 cc V6; 280 hp at 6,000 rpm and 262 lb-ft at 4,700 rpm. | 24-valve SOHC i-VTEC with Variable Cylinder Management (VCM). Honda lists these specifications across the 2021 Pilot trims in its sheet. | An SUV application that makes clear why the “best” engine depends on vehicle role, not just peak output. American Honda’s 2021 Pilot specifications. |
BMW B58: the performance-oriented choice
BMW’s U.S. specifications for the 2021 M440i xDrive describe a 3.0-liter turbocharged inline-six producing 382 hp and 369 lb-ft. BMW gives the power range as 5,800–6,500 rpm and the torque range as 1,800–5,000 rpm, rather than listing only peak figures. It states a 0–60 mph time of 4.3 seconds for the complete M440i xDrive vehicle, not for the engine in isolation. BMW’s 2021 4 Series release.
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The B58 also had recognition predating this model year: BMW announced that the engine won a 2020 Wards 10 Best Engines and Powertrains award. That is evidence of an earlier award, not a 2021 comparative win or a substitute for reliability and ownership data. BMW’s announcement of the 2020 award.
Toyota GR Supra: a close paper match, not a controlled rival test
Toyota Canada’s release for the 2021 GR Supra 3.0 lists its turbocharged 3.0-liter inline-six at 382 hp and 368 lb-ft. Toyota reports 0–96 km/h in 3.9 seconds and describes exhaust-manifold and piston changes, along with chassis recalibration, for the 2021 model. The release is Canadian; its specifications should not be generalized to every market without checking the relevant local model information. Toyota Canada’s 2021 announcement.
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- Delivers 20% better wear protection and 15% better sludge defense than industry standards to help prevent engine breakdown
- Extra detergents safeguard against friction, corrosion and deposits to keep high-mileage engines clean
- Advanced friction-fighting additives help maximize performance and improve fuel efficiency
- Provides performance benefits for high mileage, new and re-built engines alike
On paper, the Supra and M440i xDrive share a 382-hp rating and have torque figures only 1 lb-ft apart in the cited materials. That does not establish that one accelerates faster: BMW reports 0–60 mph, while Toyota reports 0–96 km/h, and neither source establishes a common test protocol. The figures apply to different vehicles and come from different market-specific releases.
Honda Pilot: why an SUV V6 belongs in the discussion
Honda’s U.S. specification sheet for the 2021 Pilot lists a 3,471 cc V6 rated at 280 hp and 262 lb-ft, with 24-valve SOHC i-VTEC and Variable Cylinder Management. Those figures are materially below the sports-car examples’ peak outputs, but the Pilot serves a different purpose. Comparing peak horsepower alone would miss the basic distinction between a six-cylinder engine selected for a sports car and one specified for a family SUV. Honda’s Pilot specifications and features.
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What the specifications can—and cannot—tell you
- Configuration: BMW and Toyota’s examples are inline-sixes; Honda’s is a V6. The sources document these layouts but do not establish a universal advantage for either configuration.
- Output: The two sports-car entries are both rated at 382 hp in their respective releases; the Pilot is listed at 280 hp. Different vehicle roles make peak output an incomplete basis for choosing an engine.
- Acceleration: The BMW and Toyota times are manufacturer-stated vehicle figures with different measurement units. Without a shared test definition and conditions, they should not be treated as directly comparable results.
- Ownership: These specifications and the BMW award do not establish comparative reliability, long-term durability, maintenance cost, fuel economy, sound quality or tuning potential.
For the documented examples here, BMW’s B58 and Toyota’s Supra inline-six are the clearest performance-oriented candidates; Honda’s Pilot V6 shows the practical SUV side of the category. The evidence supports a role-based shortlist, not a definitive winner across the 2021 market.
Quick Recap
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- Formulated with seal conditioners to help prevent oil leaks, reduce oil consumption, and improve fuel economy
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Rank #4
- Formulated for engines with 75,000 miles or more, Valvoline MaxLife High Mileage synthetic blend is formulated with seal conditioners to help prevent oil leaks and reduce oil consumption
- Delivers 20% better wear protection and 15% better sludge defense than industry standards to help prevent engine breakdown
- Extra detergents safeguard against friction, corrosion and deposits to keep high-mileage engines clean
- Advanced friction-fighting additives help maximize performance and improve fuel efficiency
- Provides performance benefits for high mileage, new and re-built engines alike
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