What are the main differences between Buicks and Cadillacs on the same platform? (Explained in detail)

Last Updated on July 22, 2022 by John K. Clifford

GM has various platforms with established suspensions, axles, and steering mechanisms to fit different powertrains and bodies of their vehicle brands. There are multiple Buicks and Cadillacs models that share a platform. These models are similar, with their main difference being design and interior details.

A vehicle platform is a shared design, engineering, and production feature. Platform sharing is not new or uncommon in the automotive industry as it helps manufacturers reduce the cost of production.

Most vehicles that share platforms are similar, but some aren’t even in the same class. Buicks and Cadillacs that share a platform are like fraternal twins; quite similar but very distinct.

So, how do Cadillac and Buick models that share a platform compare? Here, I take you through the various Buick and Cadillac models with the same platform. We look at their differences in depth; be ready to be surprised!

Which Buick and Cadillac models share a platform?

Cadillac XT5 and Buick Enclave

The Cadillac XT5 and Buick Enclave are mid-size SUVs built on the GM C1 platform. The models have much in common, including fuel consumption and transmission type. When it comes to comfort, the Buick Enclave wins thanks to its ample space and legroom at the front and back. The Buick Enclave also has more horsepower than the Cadillac XT5. The Cadillac XT5 is more powerful and faster compared to the Buick Enclave.

Let’s compare their features and specs in detail.

 Buick EnclaveCadillac XT5
Engine3.6-liter, gasoline-powered V6 engine3.6-liter, gasoline-powered V6 engine Also available with a 2.0-liter 4-cylinder gasoline engine
Horsepower310 horsepower235 or 310 horsepower
Transmission9-speed automatic9- speed automatic
DrivetrainAll-wheel drive and front-wheel driveAvailable in All wheel drive and front-wheel drive
Warranty36,000 miles or 3 years50,000 miles or 4 years

Cadillac XTS and Buick Lacrosse

The Cadillac XTS and Buick Lacrosse are full-size sedans with the General Motors Epsilon platform. This platform is a mid-size front-wheel drive that was launched in 2003. These two models are similar yet so different. They have many shared features, and their main difference is in design and interior styling.

Below is a summary of their features for better comparison.

 Cadillac XTSBuick Lacrosse
Transmission6-speed automatic9-speed automatic
DrivetrainFront-wheel driveAll-wheel drove
Fuel economy city/highway20/29 MPG19/28 MPG
Fuel tank capacity19 gallons16.2 gallons
Fuel typeGasolineGasoline
Power304 hp @ 6800 RPM310 HP @ 6800 RPM
Torque264 lb-ft @ 5,300 RPM268 lb-ft @ 5,200 RPM
Cylinders6 cylinders6 cylinders
Displacement3600 cc3600 cc
Compression ratio11.5: 111.5:1

Cadillac CT6 and Buick Avenir concept car

The 2016 Cadillac CT6 and 2015 Buick Avenir concept car all feature the GM Omega platform. This platform is designed for full-size, rear-wheel, and all-wheel drive luxury vehicles. This platform debuted in the 2016 Cadillac CT6 Sedan.

The Buick Avenir is still a concept whose production is yet to start. It was unveiled at the 2015 North American International Auto show. The model featured a front direct-injection V6 engine with 9-speed automatic transmission.

The Cadillac CT6 is a full-size luxury sedan with a 3.0L V6 engine with various engine and transmission options. The main difference between the Cadillac CT6 and Buick Avenir is in the interior details and outside design

2013–present Buick Encore and Cadillac Urban Luxury concept cars. (Gamma II)

The Cadillac Urban Luxury Concept car and the Buick Encore have the Gamma II platform. This Chassis is specifically designed for small cars by the GM Korea plant. The Cadillac Urban Luxury Concept car is a gasoline-electric hybrid that is GM’s attempt at a green car.

The Buick Encore is a small SUV that features lots of technological features. When you compare it to the Cadillac concept car that shares the same platform, the difference is like day and night. Since the concept car hasn’t started production yet, it’s hard to tell whether the two models have anything else in common.

Is Cadillac better than Buick?

According to Consumer reports and other reliability ratings, Buick is more reliable than Cadillac. Buick ranks fourth in reliability while Cadillac is 21st on consumer reports ranking. Buick has fewer problems than Cadillac, and most of these issues are minor.

Maintaining and repairing a Buick is also more affordable than keeping a Cadillac. According to repair pal, the average annual repair cost for Cadillac is $783 while that of Buick is $608.

Both Cadillac and Buick are luxury cars with excellent and well-thought-out features. The best model depends on your individual taste and preference, so look at both options and their features to judge which is the best.

Is a vehicle platform the same as Chassis?

Yes, they mean the same things, but a platform is a more specific term. A chassis can be defined as the parts or components that build a vehicle, including the frame, suspension, and unibody. On the other hand, a platform is when these components have been put together and can be shared between models.

What other models share a platform?

Other than the Buick and Cadillac models mentioned above, various models share a platform across the brand. Let’s look at some of the models you wouldn’t tell share a platform.

  • Chevrolet Camaro and Cadillac ATS- these models are built on the GM Alpha platform
  • Infiniti QX70 and Nissan 370Z-  this is a bit expected because they are sister companies; they share a platform and various other features
  • BMW 7 Series and Rolls-Royce
  • VW Touran and Audi TT

Key Insights and takeaway

GM was the first manufacturer to use the same platform on different vehicles to cut the cost of production. Almost all manufacturers have adopted the concept of sharing a platform, with some models sharing platforms across brands. Buick and Cadillacs are all luxury cars that are not new to sharing platforms. We hope you now have a clear picture of models from these brands that share a platform.

The various comparisons show that the main difference between Buicks and Cadillacs with the same platform is the interior details, design, and some tech features. Some models share a platform but have different engines and drivetrain systems.

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