1991 Ford Mustang Oil Type & Capacity
The 1991 Ford Mustang oil type depends on the engine: the GT, 2D Convertible, Automatic takes 10W-30 (5.0 quarts with filter); the GT, 2D Convertible, Standard takes 10W-30 (5.0 quarts with filter); the GT, 2D Hatchback, Automatic takes 10W-30 (5.0 quarts with filter); the GT, 2D Hatchback, Standard takes 10W-30 (5.0 quarts with filter); the LX, 2D Convertible, 2.3 M, Automatic takes 5W-30 (5.0 quarts with filter); the LX, 2D Convertible, 2.3 M, Standard takes 5W-30 (5.0 quarts with filter); the LX, 2D Convertible, 5.0 E, Automatic takes 10W-30 (5.0 quarts with filter); the LX, 2D Convertible, 5.0 E, Standard takes 10W-30 (5.0 quarts with filter); the LX, 2D Hatchback, 2.3 M, Automatic takes 5W-30 (5.0 quarts with filter); the LX, 2D Hatchback, 2.3 M, Standard takes 5W-30 (5.0 quarts with filter); the LX, 2D Hatchback, 5.0 E, Automatic takes 10W-30 (5.0 quarts with filter); the LX, 2D Hatchback, 5.0 E, Standard takes 10W-30 (5.0 quarts with filter); the LX, 2D Sedan, 2.3 M, Automatic takes 5W-30 (5.0 quarts with filter); the LX, 2D Sedan, 2.3 M, Standard takes 5W-30 (5.0 quarts with filter); the LX, 2D Sedan, 5.0 E, Automatic takes 10W-30 (5.0 quarts with filter); the LX, 2D Sedan, 5.0 E, Standard takes 10W-30 (5.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- GT, 2D Convertible, Automatic: 10W-30, 5.0 quarts with filter
- GT, 2D Convertible, Standard: 10W-30, 5.0 quarts with filter
- GT, 2D Hatchback, Automatic: 10W-30, 5.0 quarts with filter
- GT, 2D Hatchback, Standard: 10W-30, 5.0 quarts with filter
- LX, 2D Convertible, 2.3 M, Automatic: 5W-30, 5.0 quarts with filter
- LX, 2D Convertible, 2.3 M, Standard: 5W-30, 5.0 quarts with filter
- LX, 2D Convertible, 5.0 E, Automatic: 10W-30, 5.0 quarts with filter
- LX, 2D Convertible, 5.0 E, Standard: 10W-30, 5.0 quarts with filter
- LX, 2D Hatchback, 2.3 M, Automatic: 5W-30, 5.0 quarts with filter
- LX, 2D Hatchback, 2.3 M, Standard: 5W-30, 5.0 quarts with filter
- LX, 2D Hatchback, 5.0 E, Automatic: 10W-30, 5.0 quarts with filter
- LX, 2D Hatchback, 5.0 E, Standard: 10W-30, 5.0 quarts with filter
- LX, 2D Sedan, 2.3 M, Automatic: 5W-30, 5.0 quarts with filter
- LX, 2D Sedan, 2.3 M, Standard: 5W-30, 5.0 quarts with filter
- LX, 2D Sedan, 5.0 E, Automatic: 10W-30, 5.0 quarts with filter
- LX, 2D Sedan, 5.0 E, Standard: 10W-30, 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GT, 2D Convertible, Automatic — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| GT, 2D Convertible, Standard — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| GT, 2D Hatchback, Automatic — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| GT, 2D Hatchback, Standard — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Convertible, 2.3 M, Automatic — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Convertible, 2.3 M, Standard — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Convertible, 5.0 E, Automatic — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Convertible, 5.0 E, Standard — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Hatchback, 2.3 M, Automatic — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Hatchback, 2.3 M, Standard — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Hatchback, 5.0 E, Automatic — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Hatchback, 5.0 E, Standard — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Sedan, 2.3 M, Automatic — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Sedan, 2.3 M, Standard — 2.3L Eng | SAE 5W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Sedan, 5.0 E, Automatic — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
| LX, 2D Sedan, 5.0 E, Standard — 5.0L Eng | SAE 10W-30 Super Premium Motor Oil | 5.00 QTS. | 4.00 QTS. | — |
Buy the right oil
Buy 10W-30 motor oil on AmazonBuy 5W-30 motor oil on Amazon1991 Ford Mustang oil filter on AmazonAs an Amazon Associate we earn from qualifying purchases made through these links.
More specs & repair guides for your Mustang
1991 Ford Mustang factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
14.1 quarts (13.34 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water
Frequently asked questions
What type of oil does a 1991 Ford Mustang take?
It depends on the engine: GT, 2D Convertible, Automatic uses 10W-30; GT, 2D Convertible, Standard uses 10W-30; GT, 2D Hatchback, Automatic uses 10W-30; GT, 2D Hatchback, Standard uses 10W-30; LX, 2D Convertible, 2.3 M, Automatic uses 5W-30; LX, 2D Convertible, 2.3 M, Standard uses 5W-30; LX, 2D Convertible, 5.0 E, Automatic uses 10W-30; LX, 2D Convertible, 5.0 E, Standard uses 10W-30; LX, 2D Hatchback, 2.3 M, Automatic uses 5W-30; LX, 2D Hatchback, 2.3 M, Standard uses 5W-30; LX, 2D Hatchback, 5.0 E, Automatic uses 10W-30; LX, 2D Hatchback, 5.0 E, Standard uses 10W-30; LX, 2D Sedan, 2.3 M, Automatic uses 5W-30; LX, 2D Sedan, 2.3 M, Standard uses 5W-30; LX, 2D Sedan, 5.0 E, Automatic uses 10W-30; LX, 2D Sedan, 5.0 E, Standard uses 10W-30.
How much oil does a 1991 Ford Mustang take?
Capacity depends on the engine: GT, 2D Convertible, Automatic holds 5.0 quarts with filter; GT, 2D Convertible, Standard holds 5.0 quarts with filter; GT, 2D Hatchback, Automatic holds 5.0 quarts with filter; GT, 2D Hatchback, Standard holds 5.0 quarts with filter; LX, 2D Convertible, 2.3 M, Automatic holds 5.0 quarts with filter; LX, 2D Convertible, 2.3 M, Standard holds 5.0 quarts with filter; LX, 2D Convertible, 5.0 E, Automatic holds 5.0 quarts with filter; LX, 2D Convertible, 5.0 E, Standard holds 5.0 quarts with filter; LX, 2D Hatchback, 2.3 M, Automatic holds 5.0 quarts with filter; LX, 2D Hatchback, 2.3 M, Standard holds 5.0 quarts with filter; LX, 2D Hatchback, 5.0 E, Automatic holds 5.0 quarts with filter; LX, 2D Hatchback, 5.0 E, Standard holds 5.0 quarts with filter; LX, 2D Sedan, 2.3 M, Automatic holds 5.0 quarts with filter; LX, 2D Sedan, 2.3 M, Standard holds 5.0 quarts with filter; LX, 2D Sedan, 5.0 E, Automatic holds 5.0 quarts with filter; LX, 2D Sedan, 5.0 E, Standard holds 5.0 quarts with filter.
Can I use synthetic oil in my 1991 Ford Mustang?
Yes. 10W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Ford Mustang. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.