1985 Eldorado
Few changes were evident on the luxury front-drive personal coupe and convertible. The Biarritz convertible, introduced for 1984, could now get an optional electric defogger for its glass back window. New spoked aluminum alloy road wheels joined the option list. Standard engine remained the 4.1 liter V-8, with throttle-body fuel injection, hooked to four-speed overdrive automatic transmission. A big diesel V-8 also was available (at extra cost) in the coupe.
1985 Eldorado
Eldo's Biarritz coupe had a cabriolet vinyl roof with brushed steel cap, accent moldings, and opera lamps. Convertibles were similarly decked out. Touring Coupes had a stiffer suspension as well as blackout and body-color trim. Eldo coupes began at $21,355, but the convertible cost over $11,000 more. This would be the ragtop's final season, as Eldorado switched to a new body for 1986.
| Model | Series Number | Body/Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
| Eldorado (V-8) | 6E | L57 | 2-door Coupe | 6 | $21,355 | 3623 lb | 74,101 |
| Eldorado (V-8) | 6E | L67 | 2-door Convertible | 6 | $32,105 | 3804 lb | 2300 |
Engine note: Diesel V-8s available at no extra charge.
| Feature | Basic Gasoline Engine | Optional Diesel Engine |
| Type | 90-degree, overhead valve V-8. Cast iron block and head | 90-degree, overhead valve V-8. Cast iron block and head |
| Displacement | 249 cu. in. (4.1 liters | 350 cu. in. (5.7 liters |
| Bore & stroke | 3.47 x 3.31 in. | 4.06 x 3.39 in. |
| Compression ratio | 8.5:1 | 22.7:1 |
| Brake horsepower | 135 at 4400 R.P.M. | 105 at 3200 R.P.M. |
| Torque | 200 lbs.-ft. at 2200 R.P.M. | 200 lbs.-ft. at 1600 R.P.M. |
| Main bearings | Five | Five |
| Valve lifters | Hydraulic | Hydraulic |
| Fuel supply | Fuel injection | Fuel injection |
| Manufacturer | Cadillac | Oldsmobile |
| Wheelbase | 114.0 in. |
| Overall length | 204.5 in. |
| Height | 54.3 in. |
| Width | 70.6 in. |
| Front Tread | 59.3 in. |
| Rear Tread | 60.6 in. |
| Standard Tires | P205/75R14 SBR WSW |
| Transmission | Four-speed overdrive auto. (THM325-4L |
| Gear ratio | (1st) 2.74:1; (2nd) 1.57:1; (3rd) 1.00:1; (4th) 0.67:1; (Rev) 2.07:1 |
| Standard final drive ratio | 3.15:1 except with diesel, 2.93:1 |
| Steering | recirculating ball |
| Front suspension | torsion bars, upper/lower control arms. stabilizer bar |
| Rear suspension | independent with semi-trailing arms, coil springs, stabilizer bar and electronic level control |
| Brakes | four-wheel discs |
| Disc dia. | 10.4 in. |
| Fuel tank | 20.3 gal. except diesel 22.8 gal. |
1984