Most Replaced Parts on the 6th Gen Buick Regal (2018-2020)

The Regal 6th Gen ran from 2018-2020 and is Sportback and TourX. After enough of these come across the parts counter you start to see the same short list of components over and over. Here is what owners of this generation actually end up buying, and what to know before you order.

Cooling System

The usual tell is crusty orange residue around a hose clamp or the surge tank seam. Mileage is a rough guide here. Load, heat and road surface matter more.

Common parts in this group: radiators, water pumps, thermostats, coolant hoses, cooling fans.

Worth knowing: Aftermarket radiators frequently use fewer rows or thinner tanks than the original, which shows up as a heat problem only when you tow.

Drivetrain and Transfer Case

The usual tell is vibration that appears above 55 mph and grows with speed. Heat is the accelerant on this one, which is why it shows up faster here than up north.

Common parts in this group: transfer case encoder motors, front differential actuators, u-joints, CV axles, driveshaft center bearings.

Worth knowing: Wheel bearings on modern GM trucks carry the wheel speed sensor in the same assembly, and sensor tolerance affects ABS and stability control.

Ignition and Engine Management

The usual tell is a rough idle that smooths out above 2,000 rpm. Owners who do mostly short trips see this sooner than the mileage suggests.

Common parts in this group: spark plugs, ignition coils, camshaft position sensors, crankshaft position sensors, oxygen sensors.

Worth knowing: Oxygen sensor response time is what the fuel trim strategy is built around; slow generic sensors cause driveability problems that never set a clean code.

Brakes

The usual tell is a grinding noise, which means the friction material is already gone. Owners who do mostly short trips see this sooner than the mileage suggests.

Common parts in this group: brake pads, brake rotors, brake calipers, brake hoses, wheel speed sensors.

Worth knowing: Aftermarket rotors are frequently thinner at the same nominal diameter, which changes heat capacity and warp behavior.

Heating and Air Conditioning

The usual tell is vents that will not switch from defrost to floor. Owners who do mostly short trips see this sooner than the mileage suggests.

Common parts in this group: cabin air filters, blower motors, blower motor resistors, A/C compressors, condensers.

Worth knowing: R-1234yf systems on newer GM vehicles use different oils and fittings than older R-134a systems.

Filters and Fluids

The usual tell is reduced airflow from the vents. The number in the manual assumes conditions most people in North Texas do not have.

Common parts in this group: oil filters, air filters, cabin air filters, fuel filters, transmission filters.

Worth knowing: Air filter media density affects the mass airflow reading, which is a fueling input.

Before You Order

Have the VIN ready. On a Regal the same model year can carry two or three different engines and several suspension packages.
Check the SPID label in the glove box or console for your RPO codes.
Front and rear parts are rarely the same number, even when they look identical.
If the part is electrical, confirm the fit before you order. Electrical parts are not returnable at any GM dealer, including us.

We stock genuine GM parts for every nameplate on this list and ship nationwide from Dallas. Start at our Buick OEM parts catalog, or search for Regal parts if you already know what you need.