2006 Cadillac STS Sedan Review | Edmunds.com

2006 Cadillac STS Sedan

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Cadillac STS Features and Specs

Features & Specs

  • Engine 4.6 L V 8-cylinder
  • Drivetrain Rear Wheel Drive
  • Transmission 5-speed Automatic
  • Horse Power 320 hp @ 6400 rpm
  • Fuel Economy 15/24 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.

Gas Mileage


  • 15
  • cty
  • 24
  • highway
Calculate Yearly Fuel Costs
What Others Are Saying

Customer Reviews

The good outweighs the bad

by on
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.

Not bad for a used

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

Bought the caddie STS 06 v8 with 50,000k. IT was out of warranty though but that didn't bother me. Its a great car and very stylish. I had the CTS 07 2.8l prior and traded that in for a little more luxury. Only paid additional 3,000 for difference. Again great car and very happy. Had small minors repairs like mass air flow sensor replaced and rear brake pads. I do a lot of driving and have already put almost 10,000 miles in 8 months. This car can go on for a very long time. Just maintain the oil changes every 5,000 or 6,000 miles using synthetic motor oil for the STS v8. Highly Recommend putting Super or premium gasoline in this car for better engine protection and performance. :)

I love this car

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

I drove Japanese cars my whole life. I am 52. This 2006 STS V-8 was purchased with 28,000 miles in June of 2010. Paid 21,000 and added a $3,000 bumper to bumper additional 50,000 mile warranty. This car is solid, No outside noise heard. Beautiful on the outside and inside. The most powerful engine I've ever had and it moves effortlessly. The tach never has to go higher than 2200 rpm even at 80 mph. There is a penalty for all this power. I probably will spend $1500- 2000 more money in gas per year than my V-6 Maxima and avalon engines. I couldn't afford a new STS. So I got lucky getting an 06 with only 28,000 miles. And it doesn't have a scratch. Looks like new. Who uses the glove box

Glad i bought it used

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

have read many reviews. I agree: a little firmer than my 2001 SLS. Not used to bumpier ride. Mileage is 13 in town and 19 on the road with hi test and Cad recommended fuel (Texaco). I test drove an 80,000 mile BMW 750i before and much nicer and same price. Retails for $101K now but an STS V-8 is easily $68K. Next time or next car: AWD

2 of 2 people found this review helpful

Beautiful but unreliable

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

I've owned the car 6 months (bought it used with 30,000 miles - now have 36,000 miles on it); drives beautifully but have had 3 major repairs (fortunately still under warranty): engine oil lead (had to disassemble and replace gasket), a/c (needed new compressor), and most recently, coolant leak (needed new water pump). These are repairs I would not expect before 100,000 miles.

Don't buy this car -

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

I purchased a Certified 2006 STS w/ 20,000 miles in July 2008. Excellent condition. I traded my Toyota Solara with no regrets until ... the moaning sounds started. Forget driving this car on long interstate trips involving mountains. This is the most annoying noise ever. I've had it to the dealer 6 times for repair without any luck. They claim to "reprogram" whatever it is they "reprogram," but it never repairs the problem. I didn't think a car like this with over a $55,000 price tag new would have so many problems. I cannot speak for the V6, but the V8 is not up to par with even the 3.0 V6 in my former vehicle the Solara. I'm ready for another Toyota! Tell me again why GM is in a mess?


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.


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....

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

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