1991 GMC Sonoma Oil Type & Capacity
The 1991 GMC Sonoma oil type depends on the engine: the Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.5 A, Standard takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 4L60/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 700R4/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.5 E, Standard takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 2.8 R takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 4L60/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 700R4/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Standard takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 4L60/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 700R4/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Standard takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.5 A, Standard takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.5 E, Automatic, 4L60/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.5 E, Automatic, 700R4/MD8 takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.5 E, Standard takes 5W-30 (3.5 quarts qt with filter); the Base, 2D Pickup, 2.8 R takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 4L60/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 700R4/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, 4WD, Standard takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, RWD, Automatic, 4L60/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, RWD, Automatic, 700R4/MD8 takes 5W-30 (4.5 quarts qt with filter); the Base, 2D Pickup, 4.3 Z, RWD, Standard takes 5W-30 (4.5 quarts qt with filter); the Syclone, 4L60/MD8 takes 5W-30 (4.5 quarts qt with filter); the Syclone, 700R4/MD8 takes 5W-30 (4.5 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.5 A, Standard: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 4L60/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 700R4/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.5 E, Standard: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup Extra Cab, 2.8 R: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 4L60/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 700R4/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Standard: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 4L60/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 700R4/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Standard: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.5 A, Standard: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.5 E, Automatic, 4L60/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.5 E, Automatic, 700R4/MD8: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.5 E, Standard: 5W-30, 3.5 quarts with filter
- Base, 2D Pickup, 2.8 R: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 4L60/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 700R4/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, 4WD, Standard: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, RWD, Automatic, 4L60/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, RWD, Automatic, 700R4/MD8: 5W-30, 4.5 quarts with filter
- Base, 2D Pickup, 4.3 Z, RWD, Standard: 5W-30, 4.5 quarts with filter
- Syclone, 4L60/MD8: 5W-30, 4.5 quarts with filter
- Syclone, 700R4/MD8: 5W-30, 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 A, Standard — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 A, Standard — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.5 E, Standard — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 2.8 R — 2.8L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 4L60/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 700R4/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Standard — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 4L60/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 700R4/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Standard — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Standard — 2.5L Eng,Eng VIN A | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 A, Standard — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 E, Automatic, 4L60/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 E, Automatic, 700R4/MD8 — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.5 E, Standard — 2.5L Eng,Eng VIN E | API - SAE 5W-30 | 3.50 QTS. | 3.00 QTS. | — |
| Base, 2D Pickup, 2.8 R — 2.8L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 4L60/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 700R4/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, 4WD, Standard — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, RWD, Automatic, 4L60/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, RWD, Automatic, 700R4/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Base, 2D Pickup, 4.3 Z, RWD, Standard — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Syclone, 4L60/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
| Syclone, 700R4/MD8 — 4.3L Eng | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | — |
More factory specs & repair guides for your Sonoma
🛞 1991 GMC Sonoma Tire Size & Pressure →🌧️ 1991 GMC Sonoma Wiper Blade Sizes →💡 1991 GMC Sonoma Light Bulb Sizes →📖 1991 GMC Sonoma Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.5 quarts (10.88 L) — 56/44 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1991 GMC Sonoma take?
It depends on the engine: Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 2.5 A, Standard uses 5W-30; Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 2.5 E, Standard uses 5W-30; Base, 2D Pickup Extra Cab, 2.8 R uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Standard uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Standard uses 5W-30; Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup, 2.5 A, Standard uses 5W-30; Base, 2D Pickup, 2.5 E, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup, 2.5 E, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup, 2.5 E, Standard uses 5W-30; Base, 2D Pickup, 2.8 R uses 5W-30; Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup, 4.3 Z, 4WD, Standard uses 5W-30; Base, 2D Pickup, 4.3 Z, RWD, Automatic, 4L60/MD8 uses 5W-30; Base, 2D Pickup, 4.3 Z, RWD, Automatic, 700R4/MD8 uses 5W-30; Base, 2D Pickup, 4.3 Z, RWD, Standard uses 5W-30; Syclone, 4L60/MD8 uses 5W-30; Syclone, 700R4/MD8 uses 5W-30.
What is the oil capacity of a 1991 GMC Sonoma?
Oil capacity depends on the engine: Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 4L60/MD8 holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.5 A, Automatic, 700R4/MD8 holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.5 A, Standard holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 4L60/MD8 holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.5 E, Automatic, 700R4/MD8 holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.5 E, Standard holds 3.5 quarts with filter; Base, 2D Pickup Extra Cab, 2.8 R holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 4L60/MD8 holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Automatic, 700R4/MD8 holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, 4WD, Standard holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 4L60/MD8 holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Automatic, 700R4/MD8 holds 4.5 quarts with filter; Base, 2D Pickup Extra Cab, 4.3 Z, RWD, Standard holds 4.5 quarts with filter; Base, 2D Pickup, 2.5 A, Automatic, 4L60/MD8 holds 3.5 quarts with filter; Base, 2D Pickup, 2.5 A, Automatic, 700R4/MD8 holds 3.5 quarts with filter; Base, 2D Pickup, 2.5 A, Standard holds 3.5 quarts with filter; Base, 2D Pickup, 2.5 E, Automatic, 4L60/MD8 holds 3.5 quarts with filter; Base, 2D Pickup, 2.5 E, Automatic, 700R4/MD8 holds 3.5 quarts with filter; Base, 2D Pickup, 2.5 E, Standard holds 3.5 quarts with filter; Base, 2D Pickup, 2.8 R holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 4L60/MD8 holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, 4WD, Automatic, 700R4/MD8 holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, 4WD, Standard holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, RWD, Automatic, 4L60/MD8 holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, RWD, Automatic, 700R4/MD8 holds 4.5 quarts with filter; Base, 2D Pickup, 4.3 Z, RWD, Standard holds 4.5 quarts with filter; Syclone, 4L60/MD8 holds 4.5 quarts with filter; Syclone, 700R4/MD8 holds 4.5 quarts with filter.
How often should I change the oil in my 1991 GMC Sonoma?
Most 1991 GMC Sonoma 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 — GMC recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 GMC Sonoma?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 GMC Sonoma. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.