1983 Cadillac Fleetwood Oil Type & Capacity
The 1983 Cadillac Fleetwood oil type depends on the engine: the Base, 6.0 6 takes 5W-30 (4.0 quarts with filter); the Base, 6.0 9 takes 5W-30 (4.0 quarts with filter); the Brougham, 2D Coupe, 4.1 8 takes 5W-30 (4.0 quarts with filter); the Brougham, 2D Coupe, 5.7 N takes 10W-30 (7.0 quarts with filter); the Brougham, 4D Sedan, 4.1 8 takes 5W-30 (4.0 quarts with filter); the Brougham, 4D Sedan, 5.7 N takes 10W-30 (7.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base, 6.0 6: 5W-30, 4.0 quarts with filter
- Base, 6.0 9: 5W-30, 4.0 quarts with filter
- Brougham, 2D Coupe, 4.1 8: 5W-30, 4.0 quarts with filter
- Brougham, 2D Coupe, 5.7 N: 10W-30, 7.0 quarts with filter
- Brougham, 4D Sedan, 4.1 8: 5W-30, 4.0 quarts with filter
- Brougham, 4D Sedan, 5.7 N: 10W-30, 7.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 6.0 6 — 6.0L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Base, 6.0 9 — 6.0L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 2D Coupe, 4.1 8 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 2D Coupe, 5.7 N — 5.7L Eng | SAE 10W-30 (-20Deg.F to 60Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (Preferred) (40Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
| Brougham, 4D Sedan, 4.1 8 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 100Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 4D Sedan, 5.7 N — 5.7L Eng | SAE 10W-30 (-20Deg.F to 60Deg.F), 15W-40 (10Deg.F to Above 100Deg.F), 30 (Preferred) (40Deg.F to Above 100Deg.F) | 7.00 QTS. | — | — |
Buy the right oil
Buy 5W-30 motor oil on AmazonBuy 10W-30 motor oil on Amazon1983 Cadillac Fleetwood oil filter on AmazonAs an Amazon Associate we earn from qualifying purchases made through these links.
More specs & repair guides for your Fleetwood
1983 Cadillac Fleetwood factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
21.4 quarts (20.25 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1983 Cadillac Fleetwood take?
It depends on the engine: Base, 6.0 6 uses 5W-30; Base, 6.0 9 uses 5W-30; Brougham, 2D Coupe, 4.1 8 uses 5W-30; Brougham, 2D Coupe, 5.7 N uses 10W-30; Brougham, 4D Sedan, 4.1 8 uses 5W-30; Brougham, 4D Sedan, 5.7 N uses 10W-30.
How much oil does a 1983 Cadillac Fleetwood take?
Capacity depends on the engine: Base, 6.0 6 holds 4.0 quarts with filter; Base, 6.0 9 holds 4.0 quarts with filter; Brougham, 2D Coupe, 4.1 8 holds 4.0 quarts with filter; Brougham, 2D Coupe, 5.7 N holds 7.0 quarts with filter; Brougham, 4D Sedan, 4.1 8 holds 4.0 quarts with filter; Brougham, 4D Sedan, 5.7 N holds 7.0 quarts with filter.
Can I use synthetic oil in my 1983 Cadillac Fleetwood?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1983 Cadillac Fleetwood. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.