1991 Oldsmobile Ninety-Eight Oil Type & Capacity
The 1991 Oldsmobile Ninety-Eight takes 5W-30 motor oil — 5.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Regency Elite | API - SAE 5W-30 | 5.00 QTS. | 4.00 QTS. | — |
| Regency Touring | API - SAE 5W-30 | 5.00 QTS. | 4.00 QTS. | — |
Buy the right oil
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More specs & repair guides for your Ninety-Eight
1991 Oldsmobile Ninety-Eight factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
13.0 quarts (12.3 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1991 Oldsmobile Ninety-Eight take?
The 1991 Oldsmobile Ninety-Eight takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
How much oil does a 1991 Oldsmobile Ninety-Eight take?
The 1991 Oldsmobile Ninety-Eight holds 5.0 quarts with a filter change, or 4.0 quarts without changing the filter.
Can I use synthetic oil in my 1991 Oldsmobile Ninety-Eight?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Oldsmobile Ninety-Eight. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.