1984 Cadillac Fleetwood Oil Type & Capacity
The 1984 Cadillac Fleetwood oil type depends on the engine: the Base, 6.0 6 takes 5W-30 (4.0 quarts qt with filter); the Base, 6.0 9 takes 5W-30 (4.0 quarts qt with filter); the Brougham, 2D Coupe, 4.1 8, 200-4R/MW9 takes 5W-30 (4.0 quarts qt with filter); the Brougham, 2D Coupe, 4.1 8, 400/M40 takes 5W-30 (4.0 quarts qt with filter); the Brougham, 2D Coupe, 5.7 N takes 10W-30 (7.0 quarts qt with filter); the Brougham, 4D Sedan, 4.1 8, 200-4R/MW9 takes 5W-30 (4.0 quarts qt with filter); the Brougham, 4D Sedan, 4.1 8, 400/M40 takes 5W-30 (4.0 quarts qt with filter); the Brougham, 4D Sedan, 5.7 N takes 10W-30 (7.0 quarts qt 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, 200-4R/MW9: 5W-30, 4.0 quarts with filter
- Brougham, 2D Coupe, 4.1 8, 400/M40: 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, 200-4R/MW9: 5W-30, 4.0 quarts with filter
- Brougham, 4D Sedan, 4.1 8, 400/M40: 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 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Base, 6.0 9 — 6.0L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 2D Coupe, 4.1 8, 200-4R/MW9 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 2D Coupe, 4.1 8, 400/M40 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 2D Coupe, 5.7 N — 5.7L Eng | SAE 10W-30 (Preferred) (0Deg.F to 60Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 30 (Preferred) (0Deg.F to over 100Deg.F) | 7.00 QTS. | — | — |
| Brougham, 4D Sedan, 4.1 8, 200-4R/MW9 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 4D Sedan, 4.1 8, 400/M40 — 4.1L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to over 100Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 20W-20, 20W-40, & 20W-50 (20Deg.F to over 100Deg.F), 30 (40Deg.F to over 100Deg.F) | 4.00 QTS. | — | — |
| Brougham, 4D Sedan, 5.7 N — 5.7L Eng | SAE 10W-30 (Preferred) (0Deg.F to 60Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 30 (Preferred) (0Deg.F to over 100Deg.F) | 7.00 QTS. | — | — |
More factory specs & repair guides for your Fleetwood
🛞 1984 Cadillac Fleetwood Tire Size & Pressure →🌧️ 1984 Cadillac Fleetwood Wiper Blade Sizes →💡 1984 Cadillac Fleetwood Light Bulb Sizes →📖 1984 Cadillac Fleetwood Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network 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 1984 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, 200-4R/MW9 uses 5W-30; Brougham, 2D Coupe, 4.1 8, 400/M40 uses 5W-30; Brougham, 2D Coupe, 5.7 N uses 10W-30; Brougham, 4D Sedan, 4.1 8, 200-4R/MW9 uses 5W-30; Brougham, 4D Sedan, 4.1 8, 400/M40 uses 5W-30; Brougham, 4D Sedan, 5.7 N uses 10W-30.
What is the oil capacity of a 1984 Cadillac Fleetwood?
Oil 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, 200-4R/MW9 holds 4.0 quarts with filter; Brougham, 2D Coupe, 4.1 8, 400/M40 holds 4.0 quarts with filter; Brougham, 2D Coupe, 5.7 N holds 7.0 quarts with filter; Brougham, 4D Sedan, 4.1 8, 200-4R/MW9 holds 4.0 quarts with filter; Brougham, 4D Sedan, 4.1 8, 400/M40 holds 4.0 quarts with filter; Brougham, 4D Sedan, 5.7 N holds 7.0 quarts with filter.
How often should I change the oil in my 1984 Cadillac Fleetwood?
Most 1984 Cadillac Fleetwood owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — Cadillac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1984 Cadillac Fleetwood?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 Cadillac Fleetwood. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.