2006 Cadillac STS Sedan Review | Edmunds.com

2006 Cadillac STS Sedan

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Certified Pre-Owned (CPO) is a category of used car. Often late-model vehicles, they have been inspected, refurbished, if necessary, and are under warranty by the manufacturer.
Cadillac STS Features and Specs

Features & Specs

  • Engine 3.6 L V 6-cylinder
  • Drivetrain Rear Wheel Drive
  • Transmission 5-speed Automatic
  • Horse Power 255 hp @ 6500 rpm
  • Fuel Economy 16/25 mpg
  • Bluetooth No
  • Navigation Yes
  • Heated Seats Yes

Review of the 2006 Cadillac STS

  • Balanced driving dynamics and edgy-but-attractive styling should make the 2006 Cadillac STS a hit with buyers of all ages, especially those looking for a complete package of luxury and performance at a competitive price.

  • Safety
  • Pros

    Full-size car at a midsize price, nimble road feel, powerful engine options, available all-wheel drive, optional Bose stereo is one of the best in its class.

  • Cons

    Sporty bucket seats might be a bit firm for some, plastic interior panels not quite up to German standards, only one transmission available.

  • What's New for 2006

    Not much changes on the 2006 Cadillac STS. Items of note include the availability of all-wheel drive on V6-equipped cars, a standard Bose audio and navigation system as part of the V8 luxury package, and optional 18-inch wheels.

Full 2006 Cadillac STS Review

What's New for 2006

Not much changes on the 2006 Cadillac STS. Items of note include the availability of all-wheel drive on V6-equipped cars, a standard Bose audio and navigation system as part of the V8 luxury package, and optional 18-inch wheels.


After struggling for years to keep up with the imports, Cadillac has finally hit its stride and the STS proves it. The STS is the 2006 successor to the Seville, which was originally introduced way back in 1956 as a hardtop coupe designed to be the top performance option in the Cadillac lineup.

A 305-horsepower V8 engine and exclusive high-end interior trim ensured that the Seville was not only one of the fastest vehicles on the road, but one of the most luxurious as well. Cadillac shook things up several decades later when the all-new Seville was unveiled as a high-performance sport sedan capable of keeping up with the best Europe could offer.

Cutting-edge styling, tighter build quality and the addition of a new sport model called the STS made Cadillac the talk of the town. The introduction of the ultrahigh-tech and powerful Northstar V8 a year later further cemented the STS as one of the top performance luxury cars in the world. Another redesign for 1998 saw the Seville pick up a sophisticated array of in-car electronics. By the beginning of the current millennium, though, it had lost some of its appeal, as European and Japanese competitors surpassed it in both luxury and performance.

Cadillac has dropped the Seville name for 2006, but the revolutionary new STS definitely shares some DNA with its forebears. This car represents a quantum leap forward in technology, build quality and overall refinement. GM's globally developed Sigma platform cut its teeth as a successful backbone in the CTS, CTS-V and SRX, and was tapped once again to lend some performance cred to the big boy of the Cadillac line. Hard-edged styling introduced a few years ago on the Escalade has been trickling down to the rest of the Cadillac line, and we think it has been applied most successfully here.

Clean, elegant lines on the outside work with loads of leather and wood trim in the cabin to form a lasting impression of quality and luxury. Extra attention was given to reducing road noise, and details like a quiet steel dash, triple door seals and even "airfoil" windshield wipers designed in a wind tunnel all contribute to making this the quietest GM vehicle ever built. Engine options on the Cadillac STS include a refined new 255-horse V6 as the standard motor, and the optional 4.6-liter Northstar V8 churning out a smooth 320 ponies for those who expect a little more. A five-speed automatic channels power to the rear wheels and eight-cylinder models are available with all-wheel drive for those who need extra traction come wintertime.

Finally, this Cadillac car is a technophile's dream, thanks to goodies such as a head-up display, active climate control, Bluetooth wireless cell phone connectivity and even an optional 15-speaker Bose 5.1 surround sound audio system. Defining where the 2006 Cadillac STS fits into the luxury sedan marketplace can be a difficult task. Larger than a midsize sedan yet priced low enough to compete with considerably smaller imports, the sporty new Caddy can comfortably compete with the E-Class and 5 Series in virtually every category. For the first time in a generation, GM's premium brand is ready to take on all challengers.

Body Styles, Trim Levels, and Options

Cadillac gives buyers several STS models to choose from -- V6, V6 AWD, V8 and V8 AWD. Every STS sedan includes 17-inch wheels, leather seating, aluminum interior trim, eight-way power front seats, dual-zone climate control, an eight-speaker Bose sound system and OnStar. Popular options are grouped into three main packages. Depending on the model and trim, buyers can lux-out their STS with items like wood trim, a premium Bose sound system, satellite radio, a DVD entertainment and navigation system, adaptive cruise control, a head-up display and heated and ventilated front seats with memory recall. An adaptive suspension system (Magnetic Ride Control) is also available, as are larger 18-inch wheels.

Powertrains and Performance

There are two available engines: a 3.6-liter V6 good for 255 horsepower and 252 pound-feet of torque, and a 4.6-liter V8 that generates 320 hp and 315 lb-ft of torque. Both engines feature variable valve timing and electronic throttle control. A five-speed automatic with regular and sport shift programs comes standard with either engine. Cadillac STS buyers can also choose whether they want rear-wheel drive to maximize performance and economy, or all-wheel drive for better all-weather traction.


Stability control and four-wheel antilock disc brakes with a panic assist feature are standard. Airbags include seat-mounted side bags for front occupants and head curtain airbags spanning the first and second rows. The STS has not been crash tested.

Interior Design and Special Features

Cadillac has been putting extra effort into interior quality and design as part of its self-proclaimed renaissance, and it shows. Panel fit and finish is top-notch, and premium materials such as eucalyptus wood trim and optional Tuscany leather really make the Cadillac STS shine. The automatic climate control system monitors interior temperatures in relation to outside conditions, and the driver can stay informed without looking down thanks to a four-color head-up display projected onto the windshield.

Driving Impressions

A V8 STS is not exactly sport sedan-quick in its movements, but it can be pushed hard without losing composure. With the rear wheels providing the power, Cadillac's engineers were free to focus on the kind of precise steering feel that's nearly impossible to achieve with front-wheel drive. The result is a delicate feel through the steering wheel without a numb on-center sensation or overly aggressive assistance. The standard V6 is able to get the big sedan up to speed with surprising gusto. Unlike some of its competitors whose six-cylinder offerings provide merely adequate performance, the V6 in the STS rarely feels underpowered. Step up to the V8 and the 2006 Cadillac STS really shows its mettle.

What Others Are Saying

Customer Reviews

Best car we ever drove

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Vehicle: 2006 Cadillac STS V6 4dr Sedan (3.6L 6cyl 5A)

Bought new in June 2006 for my wife and two middle school boys. Boys are grown and gone, but car is still excellent. 108,000 miles and counting. Lots of short cold winter starts which can really wear on an engine, but no problems. Used synthetic oil and changed only every 10,000 miles. Ash tray covers (f&b) both broke off, and the bushings in the front suspension have moved out of place so we do get some clunking noises over bumps. Both headlamps burned out within months of each other and were costly to replace because the whole front end had to come off. On third set of tires, otherwise no issues. If looking at used...I would buy my car again. Hope to keep it another 100,000 miles. Good GM!

8 of 8 people found this review helpful

Cadillac delivers excellence, gm does

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Vehicle: 2006 Cadillac STS V6 4dr Sedan (3.6L 6cyl 5A)

I purchased my 3.6L v6 STS fully loaded for $10,000 after my previous Cadillac, a 2000 Deville DHS, was totaled from hail damage. I needed to get a new car quickly, and I had my first Cadillac for so long with no issues; I wanted to stick to the brand. When I first sat in the vehicle the overwhelming number of "intuitive" features was extremely intimidating. Overtime, they grew on me, and the immense customization became a tool from the vehicle to optimize a perfect driving experience. However, with all the great number of features and beautiful styling of the car I found it was easy to overlook the mechanics. One week after I purchased the vehicle, I noticed a "clicking" noise. Continued:

5 of 5 people found this review helpful

No regrets

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Vehicle: 2006 Cadillac STS V6 4dr Sedan (3.6L 6cyl 5A)

I purchased the vehicle with 56,000 miles on it. I drive around 3,000 miles a month. I am 6'6" tall. The car is comfortable and rides great. It is a V6 and has enough power. I am partial to caddy's. My first car was a 1970 sedan deville. I should have purchased the all wheel drive for I live up north and the car is terrible in the snow. I currently have 114,000 miles on it with no problems. i change the oil every 3,000 miles. I am looking forward to reaching 200,000 miles.

1 of 1 people found this review helpful

Love my caddy

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Vehicle: 2006 Cadillac STS V6 4dr Sedan (3.6L 6cyl 5A)

I purchased this car certified used with 34,000 on it. So far I love the Caddy. I traded in my 2002 Lexus GS300 due to a series of electrical issues. I wanted to buy luxury and AMERICAN so I went with the STS V6. This car is a weekend driver for me as I have a company car. So far I have had it in for warranty service 3 times. The window switch in the back seat went out (roll down but not up), the ashtray trim piece broke, and the selector switch for the power mirrors broke. All under warranty. The technology in this car rivals my Dad's E350 and will out perform the Mercedes all day. It is American and has some squeaks now and then but overall a dream to drive and turns heads. Love this car

1 of 1 people found this review helpful

Nice car with a few

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Vehicle: 2006 Cadillac STS V6 4dr Sedan (3.6L 6cyl 5A)

Purchase the car used with 38,000 miles. Engine consumes a quart of oil about every 3000 miles. Using the oil recommended by Cadillac which is Mobil One-5w30. No signs of oil leaks, no smoke out of the exhaust pipe. Cadillac drive OK if you don't mind the popping sound in the driver seat when turning corners. Also, sometime the lights in the dash below the speedo/tach go out. Our third Calillac, the last two had electrical problems. After 8 years with Cadillac, this will be our last one.

The good outweighs the bad

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Vehicle: 2006 Cadillac STS V8 4dr Sedan (4.6L 8cyl 5A)

This is my 3rd Cadillac, and my second STS. The new design definitely tops my former Seville STS. It is a very fun car to drive, and has lots of power at any speed, without using Sport/Manual mode. Sure there are things I would change and things that aren't fantastic (like any car), but the good makes those easy to overlook. The styling with traditional Cadillac cues is a win for me, and I love all the bells and whistles - after all, this is a Cadillac. I feel great driving it, a very responsive car - it is difficult to find performance and luxury in the same package, but this is an example of it.

Talk About The 2006 STS

2006 Cadillac STS Discussions See all Started By

Looking to buy a new 2006 STS. The dealership still has two of them. One with 500 miles and the other with 200 miles. The MSRP was about $62K....

2004-'07 Cadillac CTS-V Recalled for Potential Overheating in Fuel Pump Modules | Edmunds.com General Motors is recalling 10,005 2004-'07 Cadillac CTS-V and 2006-'07 Cadillac STS-V sedans in the U.S. ...

I also expect that the six speed will eventually find its way into a wider range of STS-s....

Gas Mileage


  • 16
  • cty
  • 25
  • highway
Calculate Yearly Fuel Costs
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