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Buick Regal Engine Specifications

The 2020 Buick Regal is offered with 2.0L–3.6L engines in 4 and 6-cylinder form, per EPA fuel-economy records.

Latest model year (2020):

The Buick Regal is available with 4 2.0L and Automatic (S8) (All-Wheel Drive).

Verifiedfueleconomy.gov · Verified August 9, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb WeightSafety

Buick Regal Engine Specs — All Years

YearTrimCylindersDispl.TransmissionDriveFuel TypeVehicle Class
2020Config 1 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineMidsize Cars
2020Config 2 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineSmall Station Wagons
2020Config 3 of 4Auto (S9), 4 cyl, 2.0 L42.0LAutomatic (S9)Front-Wheel DrivePremium GasolineMidsize Cars
2020Config 4 of 4Auto (S9), 6 cyl, 3.6 L63.6LAutomatic (S9)All-Wheel DriveRegular GasolineMidsize Cars
2019Config 1 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineSmall Station Wagons
2019Config 2 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineMidsize Cars
2019Config 3 of 4Auto (S9), 4 cyl, 2.0 L42.0LAutomatic (S9)Front-Wheel DrivePremium GasolineMidsize Cars
2019Config 4 of 4Auto (S9), 6 cyl, 3.6 L63.6LAutomatic (S9)All-Wheel DriveRegular GasolineMidsize Cars
2018Config 1 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineLarge Cars
2018Config 2 of 4Auto (S8), 4 cyl, 2.0 L42.0LAutomatic (S8)All-Wheel DrivePremium GasolineSmall Station Wagons
2018Config 3 of 4Auto (S9), 4 cyl, 2.0 L42.0LAutomatic (S9)Front-Wheel DrivePremium GasolineLarge Cars
2018Config 4 of 4Auto (S9), 6 cyl, 3.6 L63.6LAutomatic (S9)All-Wheel DriveRegular GasolineLarge Cars
2017Config 1 of 3Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)Front-Wheel DrivePremium GasolineMidsize Cars
2017Config 2 of 3Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)All-Wheel DrivePremium GasolineMidsize Cars
2017Config 3 of 3Auto (S6), 4 cyl, 2.4 L42.4LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2016Config 1 of 5Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)All-Wheel DriveRegular GasolineMidsize Cars
2016Config 2 of 5Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2016Config 3 of 5Auto (S6), 4 cyl, 2.4 L42.4LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2016Config 4 of 5Auto (S6), 4 cyl, 2.4 L42.4LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2016Config 5 of 5Man 6-spd, 4 cyl, 2.0 L42.0LManual 6-spdFront-Wheel DriveRegular GasolineMidsize Cars
2015Config 1 of 5Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)All-Wheel DriveRegular GasolineMidsize Cars
2015Config 2 of 5Auto (S6), 4 cyl, 2.0 L42.0LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2015Config 3 of 5Auto (S6), 4 cyl, 2.4 L42.4LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2015Config 4 of 5Auto (S6), 4 cyl, 2.4 L42.4LAutomatic (S6)Front-Wheel DriveRegular GasolineMidsize Cars
2015Config 5 of 5Man 6-spd, 4 cyl, 2.0 L42.0LManual 6-spdFront-Wheel DriveRegular GasolineMidsize Cars

Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.

Buick Regal data analysis

How Buick Regal engine displacement varies

Across 25 configurations recorded for the 2015 through 2020 Buick Regal, engine displacement runs from 2 litres to 3.6 litres. The strongest figure belongs to the 2020 Buick Regal (SIDI) at 2 litres, and the weakest to the 2018 car (SIDI) at 3.6 litres — a spread of 44%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the Buick Regal would be misleading.

What changed for 2020

Average engine displacement for the 2020 Buick Regal is 2.4 litres, against 2.4 litres for the 2019 car — it held flat. A carry-over year like this usually means no powertrain or structural change, so an older example is the cheaper way into the same specification.

How to read this Buick Regal data

This page lists every 2015 through 2020 Buick Regal record we hold for this measurement — 25 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.

Configurations behind these Buick Regal numbers

The 2015 through 2020 Buick Regal entries here cover the variants SIDI and SIDI; eAssist. 2016 is the busiest model year in the record with 5 separate measured configurations, which is why a single quoted engine displacement figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.

Where these Buick Regal figures come from

Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The Buick Regal record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.

Frequently Asked Questions About Regal Engine Specs

What engine does the Buick Regal have?

The Buick Regal is available with 4 cylinder engines ranging up to 2.0L. Transmission and drivetrain options vary by trim. See the full table above.

Is the Buick Regal available with all-wheel drive?

Yes, the Buick Regal is available with all-wheel drive. Check the "Drive" column in the table above for specific trims.

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