It’s clear the cars in the photos are not the 2018 Buick Regal GS in the flesh, but they very well could be powertrain mules. Judging by the equipment, specifically the tires and brakes, General Motors engineers may be searching for the proper wheel/tire combo for the future Regal GS.
Two of the cars seen were heavily camouflaged, while two other cars wore barely any camo at all. The cars also do not sport the Regal Sportback’s waterfall grille; instead, they wear Opel’s three-dimension grille and the Opel blitz looks to be under the camo, rather than the Buick tri-shield. Looking closer at the non-camouflaged cars reveals some pretty aggressive tires, though.
The white test mule wore Cadillac-branded Brembo brake calipers and its wheels were wrapped in Bridgestone Potenza tires—hardly a tire fit for your average Regal buyer. The green car also featured some aggressive rubber, Hankook Ventus S1 Evo2 summer tires, to be exact. However, the aggressive brakes were not present.
Other than the wheels, tires and brakes, the cars look identical to their pedestrian Opel Insignia Grand Sport and Regal Sportback brethren. As far as powertrain details, Buick may drop a 3.6-liter V6 engine under the hood this time. But, it’s unclear if any turbochargers will be fitted for good measure. We have a feeling we’ll be seeing more of the hotter Regal GS in the near future.
Spy shots: Motor Trend