During 1986, sales of the Brougham increased by more than 30 percent. One result was a major effort to further improve its overall interior, exterior, and mechanical features. A new cross-hatch grille, revised header molding and new park and turn signal lamps were introduced. Red reflexes were added to the rear panel and a Cadillac script replaced the Fleetwood script on the deck lid. Brougham script replaced Fleetwood Brougham on the quarter panels. The upgraded d'Elegance version shared the features of the 1986 model along with the changes found in the Brougham. A new tri-color saddle interior combination was used on both models. The Brougham's parking lamp and rear taillights were changed from gold to silver.
| Model Number | Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
| 6D | W69 | 4-door Sedan | 6 | $23740 | 4046 lb |
| Type | 90-degree, overhead valve, V-8, cast iron block and cast iron cylinder heads |
| Displacement | 307 cu. in. (5.0 liters) |
| Bore and stroke | 3.8 in x 3.39 in. |
| Compression ratio | 8.0:1 |
| Brake horsepower | 140 @ 3200 rpm |
| Torque | 346 lb.-ft. @ 2000 rpm |
| Main Bearings | Five main bearings |
| Valve Lifters | Hydraulic valve lifters |
| Carburetor | Four-barrel carburetor |
| Wheelbase | 121.5 in |
| Overall Length | 221 |
| Height | 56.7 |
| Width | 76.5 |
| Front Tread | 61.7 |
| Rear Tread | 60.7 |
| Standard Tires | Michelin P225/75R15 |
| Transmission | THM 200-4R TCC automatic four-speed (includes overdrive and torque converter clutch) |
| Steering | power-assisted recirculating ball. |
| Steering Ratios | 19.1:1 |
| Front Suspension | Independent with short/long arms, coil springs, direct acting shock absorbers, and link-type stabilizer bar |
| Rear Suspension | four link, coil springs with automatic level control and direct acting shock absorbers. |
| Brakes | power front discs, rear drum |
| Body Construction | separate body on frame |
| Fuel Tank | 25 gal. |
1986