1991 Geo Prizm Oil Type & Capacity: 5W-30 (3.9 quarts)
The 1991 Geo Prizm takes 5W-30 motor oil — 3.9 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 3.9 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 4D Hatchback, Automatic | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| Base, 4D Hatchback, Standard | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| Base, 4D Sedan, Automatic | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| Base, 4D Sedan, Standard | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| GSi, 4D Hatchback, Automatic | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| GSi, 4D Hatchback, Standard | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| GSi, 4D Sedan, Automatic | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| GSi, 4D Sedan, Standard | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| LSi, Automatic | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
| LSi, Standard | SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F) | 3.90 QTS. | 3.60 QTS. | Use oil that has been certified by the American Petroleum Institute. |
More factory specs & repair guides for your Prizm
🛞 1991 Geo Prizm Tire Size & Pressure →🌧️ 1991 Geo Prizm Wiper Blade Sizes →💡 1991 Geo Prizm Light Bulb Sizes →📖 1991 Geo Prizm Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
5.8 quarts (5.48 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 Geo Prizm take?
The 1991 Geo Prizm takes 5W-30 motor oil (SAE 5W-30 (Below 50Deg.F), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1991 Geo Prizm?
The 1991 Geo Prizm oil capacity is 3.9 quarts with a filter change, or 3.6 quarts without changing the filter.
How often should I change the oil in my 1991 Geo Prizm?
Most 1991 Geo Prizm 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 — Geo recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Geo Prizm?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Geo Prizm. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.