1984 Cadillac DeVille Oil Type & Capacity
The 1984 Cadillac DeVille oil type depends on the engine: the 2D Coupe, 4.1 8, 200-4R/MW9 takes 5W-30 (4.0 quarts qt with filter); the 2D Coupe, 4.1 8, 400/M40 takes 5W-30 (4.0 quarts qt with filter); the 2D Coupe, 5.7 N takes 10W-30 (7.0 quarts qt with filter); the 4D Sedan, 4.1 8, 200-4R/MW9 takes 5W-30 (4.0 quarts qt with filter); the 4D Sedan, 4.1 8, 400/M40 takes 5W-30 (4.0 quarts qt with filter); the 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:
- 2D Coupe, 4.1 8, 200-4R/MW9: 5W-30, 4.0 quarts with filter
- 2D Coupe, 4.1 8, 400/M40: 5W-30, 4.0 quarts with filter
- 2D Coupe, 5.7 N: 10W-30, 7.0 quarts with filter
- 4D Sedan, 4.1 8, 200-4R/MW9: 5W-30, 4.0 quarts with filter
- 4D Sedan, 4.1 8, 400/M40: 5W-30, 4.0 quarts with filter
- 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 |
|---|---|---|---|---|
| 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. | — | — |
| 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. | — | — |
| 2D Coupe, 5.7 N — 5.7L Eng | SAE 10W-30 (0Deg.F to 60Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 30 (0Deg.F to over 100Deg.F) | 7.00 QTS. | — | — |
| 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. | — | — |
| 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. | — | — |
| 4D Sedan, 5.7 N — 5.7L Eng | SAE 10W-30 (0Deg.F to 60Deg.F), 15W-40 (10Deg.F to over 100Deg.F), 30 (0Deg.F to over 100Deg.F) | 7.00 QTS. | — | — |
More factory specs & repair guides for your DeVille
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Coolant capacity
11.0 quarts (10.4 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 DeVille take?
It depends on the engine: 2D Coupe, 4.1 8, 200-4R/MW9 uses 5W-30; 2D Coupe, 4.1 8, 400/M40 uses 5W-30; 2D Coupe, 5.7 N uses 10W-30; 4D Sedan, 4.1 8, 200-4R/MW9 uses 5W-30; 4D Sedan, 4.1 8, 400/M40 uses 5W-30; 4D Sedan, 5.7 N uses 10W-30.
What is the oil capacity of a 1984 Cadillac DeVille?
Oil capacity depends on the engine: 2D Coupe, 4.1 8, 200-4R/MW9 holds 4.0 quarts with filter; 2D Coupe, 4.1 8, 400/M40 holds 4.0 quarts with filter; 2D Coupe, 5.7 N holds 7.0 quarts with filter; 4D Sedan, 4.1 8, 200-4R/MW9 holds 4.0 quarts with filter; 4D Sedan, 4.1 8, 400/M40 holds 4.0 quarts with filter; 4D Sedan, 5.7 N holds 7.0 quarts with filter.
How often should I change the oil in my 1984 Cadillac DeVille?
Most 1984 Cadillac DeVille 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 DeVille?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 Cadillac DeVille. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.