1991 Pontiac Grand Prix Oil Type & Capacity
The 1991 Pontiac Grand Prix oil type depends on the engine: the GT, 3.1 T takes 5W-30 (4.0 quarts qt with filter); the GT, 3.4 X, Automatic takes 5W-30 (5.0 quarts qt with filter); the GT, 3.4 X, Standard takes 5W-30 (5.0 quarts qt with filter); the GTP takes 5W-30 (5.0 quarts qt with filter); the LE, 2.3 D, 125C/MD9 takes 5W-30 (4.0 quarts qt with filter); the LE, 2.3 D, 3T40/MD9 takes 5W-30 (4.0 quarts qt with filter); the LE, 3.1 T takes 5W-30 (4.0 quarts qt with filter); the SE, 2D Coupe, 2.3 D, 125C/MD9 takes 5W-30 (4.0 quarts qt with filter); the SE, 2D Coupe, 2.3 D, 3T40/MD9 takes 5W-30 (4.0 quarts qt with filter); the SE, 2D Coupe, 3.1 T takes 5W-30 (4.0 quarts qt with filter); the SE, 2D Coupe, 3.4 X, Automatic takes 5W-30 (5.0 quarts qt with filter); the SE, 2D Coupe, 3.4 X, Standard takes 5W-30 (5.0 quarts qt with filter); the SE, 4D Sedan, 2.3 D, 125C/MD9 takes 5W-30 (4.0 quarts qt with filter); the SE, 4D Sedan, 2.3 D, 3T40/MD9 takes 5W-30 (4.0 quarts qt with filter); the SE, 4D Sedan, 3.1 T takes 5W-30 (4.0 quarts qt with filter); the SE, 4D Sedan, 3.4 X takes 5W-30 (5.0 quarts qt with filter); the STE, 3.1 T takes 5W-30 (4.0 quarts qt with filter); the STE, 3.4 X, Automatic takes 5W-30 (5.0 quarts qt with filter); the STE, 3.4 X, Standard takes 5W-30 (5.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- GT, 3.1 T: 5W-30, 4.0 quarts with filter
- GT, 3.4 X, Automatic: 5W-30, 5.0 quarts with filter
- GT, 3.4 X, Standard: 5W-30, 5.0 quarts with filter
- GTP: 5W-30, 5.0 quarts with filter
- LE, 2.3 D, 125C/MD9: 5W-30, 4.0 quarts with filter
- LE, 2.3 D, 3T40/MD9: 5W-30, 4.0 quarts with filter
- LE, 3.1 T: 5W-30, 4.0 quarts with filter
- SE, 2D Coupe, 2.3 D, 125C/MD9: 5W-30, 4.0 quarts with filter
- SE, 2D Coupe, 2.3 D, 3T40/MD9: 5W-30, 4.0 quarts with filter
- SE, 2D Coupe, 3.1 T: 5W-30, 4.0 quarts with filter
- SE, 2D Coupe, 3.4 X, Automatic: 5W-30, 5.0 quarts with filter
- SE, 2D Coupe, 3.4 X, Standard: 5W-30, 5.0 quarts with filter
- SE, 4D Sedan, 2.3 D, 125C/MD9: 5W-30, 4.0 quarts with filter
- SE, 4D Sedan, 2.3 D, 3T40/MD9: 5W-30, 4.0 quarts with filter
- SE, 4D Sedan, 3.1 T: 5W-30, 4.0 quarts with filter
- SE, 4D Sedan, 3.4 X: 5W-30, 5.0 quarts with filter
- STE, 3.1 T: 5W-30, 4.0 quarts with filter
- STE, 3.4 X, Automatic: 5W-30, 5.0 quarts with filter
- STE, 3.4 X, Standard: 5W-30, 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GT, 3.1 T — 3.1L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| GT, 3.4 X, Automatic — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| GT, 3.4 X, Standard — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| GTP — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| LE, 2.3 D, 125C/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| LE, 2.3 D, 3T40/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| LE, 3.1 T — 3.1L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 2D Coupe, 2.3 D, 125C/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 2D Coupe, 2.3 D, 3T40/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 2D Coupe, 3.1 T — 3.1L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 2D Coupe, 3.4 X, Automatic — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| SE, 2D Coupe, 3.4 X, Standard — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| SE, 4D Sedan, 2.3 D, 125C/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 4D Sedan, 2.3 D, 3T40/MD9 — 2.3L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 4D Sedan, 3.1 T — 3.1L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| SE, 4D Sedan, 3.4 X — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| STE, 3.1 T — 3.1L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| STE, 3.4 X, Automatic — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| STE, 3.4 X, Standard — 3.4L Eng | API - SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F), 30 (40Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
Complete Oil Change Bundle for 1991 Pontiac Grand Prix
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More factory specs & repair guides for your Grand Prix
🛞 1991 Pontiac Grand Prix Tire Size & Pressure →🌧️ 1991 Pontiac Grand Prix Wiper Blade Sizes →💡 1991 Pontiac Grand Prix Light Bulb Sizes →📖 1991 Pontiac Grand Prix Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
12.5 quarts (11.82 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 Pontiac Grand Prix take?
It depends on the engine: GT, 3.1 T uses 5W-30; GT, 3.4 X, Automatic uses 5W-30; GT, 3.4 X, Standard uses 5W-30; GTP uses 5W-30; LE, 2.3 D, 125C/MD9 uses 5W-30; LE, 2.3 D, 3T40/MD9 uses 5W-30; LE, 3.1 T uses 5W-30; SE, 2D Coupe, 2.3 D, 125C/MD9 uses 5W-30; SE, 2D Coupe, 2.3 D, 3T40/MD9 uses 5W-30; SE, 2D Coupe, 3.1 T uses 5W-30; SE, 2D Coupe, 3.4 X, Automatic uses 5W-30; SE, 2D Coupe, 3.4 X, Standard uses 5W-30; SE, 4D Sedan, 2.3 D, 125C/MD9 uses 5W-30; SE, 4D Sedan, 2.3 D, 3T40/MD9 uses 5W-30; SE, 4D Sedan, 3.1 T uses 5W-30; SE, 4D Sedan, 3.4 X uses 5W-30; STE, 3.1 T uses 5W-30; STE, 3.4 X, Automatic uses 5W-30; STE, 3.4 X, Standard uses 5W-30.
What is the oil capacity of a 1991 Pontiac Grand Prix?
Oil capacity depends on the engine: GT, 3.1 T holds 4.0 quarts with filter; GT, 3.4 X, Automatic holds 5.0 quarts with filter; GT, 3.4 X, Standard holds 5.0 quarts with filter; GTP holds 5.0 quarts with filter; LE, 2.3 D, 125C/MD9 holds 4.0 quarts with filter; LE, 2.3 D, 3T40/MD9 holds 4.0 quarts with filter; LE, 3.1 T holds 4.0 quarts with filter; SE, 2D Coupe, 2.3 D, 125C/MD9 holds 4.0 quarts with filter; SE, 2D Coupe, 2.3 D, 3T40/MD9 holds 4.0 quarts with filter; SE, 2D Coupe, 3.1 T holds 4.0 quarts with filter; SE, 2D Coupe, 3.4 X, Automatic holds 5.0 quarts with filter; SE, 2D Coupe, 3.4 X, Standard holds 5.0 quarts with filter; SE, 4D Sedan, 2.3 D, 125C/MD9 holds 4.0 quarts with filter; SE, 4D Sedan, 2.3 D, 3T40/MD9 holds 4.0 quarts with filter; SE, 4D Sedan, 3.1 T holds 4.0 quarts with filter; SE, 4D Sedan, 3.4 X holds 5.0 quarts with filter; STE, 3.1 T holds 4.0 quarts with filter; STE, 3.4 X, Automatic holds 5.0 quarts with filter; STE, 3.4 X, Standard holds 5.0 quarts with filter.
How often should I change the oil in my 1991 Pontiac Grand Prix?
Most 1991 Pontiac Grand Prix 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 — Pontiac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Pontiac Grand Prix?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Pontiac Grand Prix. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.