I bought the Deville with about 35K miles, 7 years ago. The car is best on a long trip when comfort and smooth highway handling count the most. My biggest problems have been with faulty sensors -- just about all of them to include: oil pressure, engine temp, airbag, steering, tire pressure etc. The actual components were NOT at fault. In every case it was the sensor. The other problem I had (which seems to be common among owners) is the power window motor failing. The electronic switches and displays are chintzy. Anyway, the motor is great. Uses about 1 quart per 1,600 miles. All that said, it is a fun car to drive on a trip. It depreciated quickly -- so I would shy away from buying a new one in the future.
Update on 7/6/2016: Still have the Caddie and enjoy driving it, especially on road trips. Unfortunately, the latest "service engine" light came on and provided some ugly results: "replace torque converter clutch (TCC) solenoid." This is an expensive repair where the a transmission shop has to remove the transmission to replace parts. Uggh. In searching this repair among other Caddie owners, I am not alone. Many, many owners have reported the same thing. The car has just under 100K miles, has been well maintained etc. GM knows about the recurring problems and made little/no changes to address specific and expensive problems in subsequent model years (see my original comments above). No love here for this company -- sorry. I will avoid buying a caddie in the future.
I bought this car with 89000 miles on it. two weeks after it was bought the problems started. One day while driving, the battery light came and the car shut off. I replaced the battery (what the dealership told me was the ONLY problem). after the new battery it ran fine for about a month then it started again. The dealer told me nothing was wrong with it. Every time i turn on the a/c or heat the car will shut off, even when randomly driving it shuts off. The service tire monitor light came on, fixed that only for it to come back on shortly after. Love the car despite these issues but just wish the dealer would have helped more.
Very smooth ride, comfortable for all passengers, all digital gauge cluster, lots of space, overall layout of interior fittings is great.
better MPG ( despite it being a boat of a vehicle), larger turn radius, the timing of the digital gauge cluster ( takes a while for it to switch between lighter and darker modes.
To anyone with a vibration issue. You need to keep the stock Michelin Symmetry's on the car. Once I put new tires on and went to Sullivan Tire multiple times we did it. 0 to 100 MPH, no vibration. Bad experience with Caddy dealer who had to be told to replace back seat control module twice. I wrote it in the P & S agreement the AC in the back didn't work. 1) Tire's (2) Dry boots and a broken axle 3) Broken engine front mount 4) Water pump froze and wiped out all the pully system. (5) Air intake sensor problem 6) Fuel pump float sending unit gone 7) 1-20-11 back in the shop for misfire and fuel 8) Replaced pass. window regulator
OK, once I got the vibration issue fixed and took my first road trip it was perfect. Smooth quiet and fast. I guess buying a 1 owner older woman owned always serviced at the caddy dealer didn't pay off for me.
Caddy dealerships should know about never selling a top dollar used car without the stock tires. Located in Woburn MA, skimmped on a pre-sale inspection.
2003 Cadillac DeVille DHS 4dr Sedan (4.6L 8cyl 4A)
Overall it's been a fantastic machine. Very easy to drive,comfortable and smooth. Only thing that has broken three times were the window racks that hold the glass panels. Replaced under warranty but still, shouldn't be that fragile or poorly engineered. The gas mileage is unbelievable(18 city/26 hwy) for a car that size. This car will last me a long time and gives me great pleasure in owning and driving.
Style is superb and remains up to date with 2009 styling.Most people have no idea the car is six years old. So smooth in driving and on the highway like silk. Great gas mileage. Interior very elegant with excellent sound system.
Improve the strength of the window brackets and put the battery somewhere than under the back seat.