BuickRegal Sportback2020Overview/buick/regal-sportback/2020/base/

2020 Buick Regal Sportback

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2020 Regal Sportback.

Transmission Automatic (S9)

The 2020 Buick Regal Sportback is a five-door liftback that requires 5.0 quarts of 5W-30 engine oil and pairs an automatic (S9) transmission with EPA fuel economy ratings of 22 city, 32 highway, and 26 combined mpg. With only two owner complaints—the top area being the electrical system—and two recalls, this model year sits in a favorable position within the Regal's reliability history. This suggests a generally trouble-free ownership experience for researchers evaluating the model.

Model year20202019

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity5.0 qtOEM · verified
Engine oil type5W-30OEM · verified
Lug nut torque103.0 ft-lbsOEM · verified
EPA fuel economy22/32/26 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 94R · 720 CCA battery, OE oil filter 12693541. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 94R · 720 CCAOEM · verified
Tire sizeP225/55R17 95HOEM · verified
Wheel / rim7.5 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter12693541 alt 25206377
Engine air filter23451060 alt 23430313
Spark plug12681659 alt 12646780
Battery88864542
Front wiper blades39208143 alt 13471437
Serpentine belt12664598 alt 12649097
Thermostat12630780 alt 12678779
Cabin air filter13356914

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (S9)

Dimensions & weight NHTSA vPIC

Overall length192.9 in
Overall width73.2 in
Overall height57.5 in
Wheelbase111.4 in
Curb weight4096 lb
Track (front / rear)63 / 63 in
Weight distribution (front / rear)58/42

Ratings & economy EPA / vPIC

EPA city / highway / combined22 / 32 / 26 mpg
DrivetrainFront-Wheel Drive
Recommended fuelPremium Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 5.0 qt of 5W-30 engine oil, DOT 4 brake fluid. Torque lug nuts to 103.0 ft-lbs. The firing order is 1-2-3-4-5-6.

Lubricants & capacities

Automatic Transmission Fluid Capacity9T50, 9T60
Brake FluidDOT 4
Brake Fluid Capacity0.981 pt
Engine CoolantDex-Cool
Engine Coolant Capacity5.28
Engine CoolantDex-Cool
Engine Coolant Capacity9.5
Engine Oil5W-30

Engine torques

Crankshaft Position (CKP) Sensor Bolt(s)7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)7.4 ft-lbs
Crankshaft Position (CKP) Sensor Bolt(s)7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)7.4 ft-lbs
Camshaft Bearing/Carrier Cap Bolts or Studs7.4 ft-lbs
Oxygen (O2S) Sensor Bolt(s)31.0 ft-lbs
Knock Sense (KS) Bolt(s)18.0 ft-lbs
Engine Coolant Temperature (ECT) Sensor Bolt(s)6.6 ft-lbs

Chassis torques

Differential Fill Plug29.0 ft-lbs
Differential drain Plug29.0 ft-lbs
Driveshaft Flange to TransmissionSlip Drive ft-lbs
Lug Nuts103.0 ft-lbs
Transfer Case Fill Plug30.0 ft-lbs
Transfer Case Drain Plug30.0 ft-lbs
Automatic Transmission Drain Plug8.8 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Cylinder Firing Order1-2-3-4-5-6
Spark Plug ManufacturerAC Delco
Spark Plug Type41-125
Spark Plug Gap0.037–0.043 in
Spark Plug Torque15.0 ft-lbs
Spark Plug ManufacturerAC Delco
Spark Plug Type41-130

Battery & A/C

RefrigerantR1234yf
Refrigerant Capacity1.21 lbs
Oil GroupPAG
Oil Capacity2.03 oz
Standard BCI Group Number94R
Standard BCI Cranking Performance720 cca
Standard BCI Group Number94R
Standard BCI Cranking Performance730 cca

Service checks

Key ON Engine OFF (KOEO)50.0-94.0
RPM43.0-58.0 @ Idle rpm
Engine Oil Pressure20-29 psi
Engine Oil Pressure RPM@700 RPM 100°C rpm
Engine Oil Pressure10
Intake Valve Lash0.0005–0.0020 in
Exhaust Valve Lash0.0005–0.0020 in
Intake Valve Lash0.0003–0.0016 in

Brakes

Brake Caliper Bolt to Carrier TorqueFront: 35; Rear: 26
ABS Sensor TorqueFront: 6.6; Rear: 6.6
Minimum Pad ThicknessFront: 0.078; Rear: 0.078 in
Vented Rotor Minimum Thickness for ReplacementFront: 16; Rear: 16
Vented Rotor Minimum Thickness after RefinishFront: 16; Rear: 16
Vented Rotor Maximum Scoring DepthFront: 0.059; Rear: 0.059
Variation from Parallelism Thickness VariationFront: 0.001; Rear: 0.001
Maximum Rotor RunoutFront: 0.002; Rear: 0.002

Multi-step torque procedures OEM · verified

Steering Track (Rod End) Bolts — tightening sequence 1 stages
130°-45°
Front Wheel Hub Bearing Housing Bolts — tightening sequence 1 stages
174.0 ft. lbs., Step 2: 60°-75°74 ft. lbs
Rear Wheel Hub Bearing Housing Bolts — tightening sequence 1 stages
174.0 ft. lbs., Step 2: 15°-30°74 ft. lbs
Camshaft Sprocket and/or Gear Bolt(s) — tightening sequence 1 stages
122.0 ft. lbs. Step 2: 100°22 ft. lbs
Camshaft Sprocket and/or Gear Bolt(s) — tightening sequence 1 stages
115.0 ft. lbs. Step 2: 45°15 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118.0 ft. lbs. Step 2: 110°18 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118.0 ft. lbs. Step 2: 110°18 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
1140°
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
174.0 ft. lbs. Step 2: 15074 ft. lbs
Cylinder Head — tightening sequence 1 stages
122.0 ft. lbs. Step 2: 190°22 ft. lbs
Flex or Driveplate Bolts — tightening sequence 1 stages
115 ft. lbs. Step 2: 22.0 ft. lbs. Step 3: 40°15 ft. lbs
Flex or Driveplate Bolts — tightening sequence 1 stages
122.0 ft. lbs. Step 2: 45°22 ft. lbs
Intake Manifold to Engine Bolts — tightening sequence 1 stages
118.0 ft. lbs. Step 2: 18.018 ft. lbs
Main Bearings — tightening sequence 1 stages
115.0 ft. lbs. Step 2: 140°15 ft. lbs
Oil Pump to Cylinder BLock Bolts/Studs — tightening sequence 1 stages
111.0 ft. lbs. Step 2: 110°11 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 60,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 7,500 miAccelerator Pedal (inspect) · Body Latches, Locks & Hinges (lubricate) · Brake Shift Interlock Solenoid (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Engine Air Filter Element (inspect)
Every 15,000 miWindshield Wiper Blade (replace)
Every 22,500 miCabin Air Filter (replace)
Every 45,000 miEngine Air Filter Element (replace) · Fuel Evaporative Emission Control System (inspect)
Every 60,000 miSpark Plug Wires (inspect) · Spark Plugs (replace)
Every 75,000 miHood Hinge (inspect)
At 150,000 miAccessory Drive Belt (inspect) · Drive Axle Assembly (drain & refill) · Engine Coolant System (drain, flush & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 2020 Buick Regal Sportback dominate in one area — the electrical system, 1 of 2 reports (50%), well ahead of the next concern. None of this vehicle's 2 recall campaigns target the electrical system, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the electrical system pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

2
Open recalls
NHTSA campaigns
584
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
2
Owner complaints
0 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★

Owner complaints filed with NHTSA, by component

All 2 complaints on record, top 2 components.

Electrical System1
Tires1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

19V762000SeatsReported 24/10/2019

General Motors LLC (GM) is recalling certain 2019-2020 Buick Regal vehicles. The driver or passenger front seat frames may have a lower crossbar that was improperly welded. Remedy: GM will notify owners, and dealers will inspect the crossbar welds on the front seats. If the crossbar is improperly welded, the seat back frame will be replaced, free of charge…

22V465000Service Brakes, Hydraulic:Power Assist:VacuumReported 30/06/2022

General Motors, LLC (GM) is recalling certain 2018-2020 Buick Regal vehicles. In the event of a vacuum-power brake assist failure, a software error in the electronic brake control module (EBCM) may result in a loss of… Remedy: Dealers will update the EBCM software, free of charge. Interim owner notification letters advising owners of the safety risk were mailed on August 19, 2022. Owner notification…

Technical service bulletins NHTSA · verified

Showing 5 of 584 bulletins on record with NHTSA.

BulletinDateComponentSummary
PIT3271Q2026-04-01Unknown Or OtherThis preliminary information communicates information about how to determine if a wheel…
PIP61042026-03-09Unknown Or OtherThis Preliminary information communicates the steps on how to save a GDS2 Session Log and…
PIP4902V2026-03-09Unknown Or OtherThis preliminary information advises a dealer on how to email GDS2 session logs into…
PIT6425D2026-03-02Unknown Or OtherThis Preliminary information communicates to the field on how to diagnosis a GPS issue…
PIT6425C2026-01-16Unknown Or OtherThis Preliminary information communicates to the field on how to diagnosis a GPS issue…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific Regal Sportback. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2020 Regal Sportback take?

5.0 qt of 5W-30, Dexos1 Gen 2, per the factory manual.

Does the 2020 Regal Sportback have open recalls?

NHTSA lists 2 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Regal Sportback get?

EPA figures are 22 city / 32 highway / 26 combined mpg.