1984 Oldsmobile Ninety-Eight Oil Type & Capacity
The 1984 Oldsmobile Ninety-Eight oil type depends on the engine: the Regency Brougham, 5.0 Y takes 5W-30 (4.0 quarts with filter); the Regency Brougham, 5.7 N takes 10W-30 (7.0 quarts with filter); the Regency, 2D Coupe, 5.0 Y takes 5W-30 (4.0 quarts with filter); the Regency, 2D Coupe, 5.7 N takes 10W-30 (7.0 quarts with filter); the Regency, 4D Sedan, 5.0 Y takes 5W-30 (4.0 quarts with filter); the Regency, 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:
- Regency Brougham, 5.0 Y: 5W-30, 4.0 quarts with filter
- Regency Brougham, 5.7 N: 10W-30, 7.0 quarts with filter
- Regency, 2D Coupe, 5.0 Y: 5W-30, 4.0 quarts with filter
- Regency, 2D Coupe, 5.7 N: 10W-30, 7.0 quarts with filter
- Regency, 4D Sedan, 5.0 Y: 5W-30, 4.0 quarts with filter
- Regency, 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 |
|---|---|---|---|---|
| Regency Brougham, 5.0 Y — 5.0L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above 100Deg.F), 20W-20 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Regency Brougham, 5.7 N — 5.7L Eng | SAE 10W-30 (Below -20Deg.F to 60Deg.F), 15W-40 (15Deg.F to 70Deg.F), 30 (Preferred) (32Deg.F to Above100Deg.F) | 7.00 QTS. | — | — |
| Regency, 2D Coupe, 5.0 Y — 5.0L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above 100Deg.F), 20W-20 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Regency, 2D Coupe, 5.7 N — 5.7L Eng | SAE 10W-30 (Below -20Deg.F to 60Deg.F), 15W-40 (15Deg.F to 70Deg.F), 30 (Preferred) (32Deg.F to Above100Deg.F) | 7.00 QTS. | — | — |
| Regency, 4D Sedan, 5.0 Y — 5.0L Eng | SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 or 10W-40 (0Deg.F to Above 100Deg.F), 15W-40 (15Deg.F to Above 100Deg.F), 20W-20 (20Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Regency, 4D Sedan, 5.7 N — 5.7L Eng | SAE 10W-30 (Below -20Deg.F to 60Deg.F), 15W-40 (15Deg.F to 70Deg.F), 30 (Preferred) (32Deg.F to Above100Deg.F) | 7.00 QTS. | — | — |
Buy the right oil
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More specs & repair guides for your Ninety-Eight
1984 Oldsmobile Ninety-Eight factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
15.5 quarts (14.66 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 Oldsmobile Ninety-Eight take?
It depends on the engine: Regency Brougham, 5.0 Y uses 5W-30; Regency Brougham, 5.7 N uses 10W-30; Regency, 2D Coupe, 5.0 Y uses 5W-30; Regency, 2D Coupe, 5.7 N uses 10W-30; Regency, 4D Sedan, 5.0 Y uses 5W-30; Regency, 4D Sedan, 5.7 N uses 10W-30.
How much oil does a 1984 Oldsmobile Ninety-Eight take?
Capacity depends on the engine: Regency Brougham, 5.0 Y holds 4.0 quarts with filter; Regency Brougham, 5.7 N holds 7.0 quarts with filter; Regency, 2D Coupe, 5.0 Y holds 4.0 quarts with filter; Regency, 2D Coupe, 5.7 N holds 7.0 quarts with filter; Regency, 4D Sedan, 5.0 Y holds 4.0 quarts with filter; Regency, 4D Sedan, 5.7 N holds 7.0 quarts with filter.
Can I use synthetic oil in my 1984 Oldsmobile Ninety-Eight?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1984 Oldsmobile Ninety-Eight. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.