1991 Isuzu Pickup Oil Type & Capacity
The 1991 Isuzu Pickup oil type depends on the engine: the 1 Ton, MSG5C takes 5W-20 (5.2 quarts qt with filter); the 1 Ton, MUA5C takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup Extra Cab, 4WD takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup Extra Cab, RWD, Automatic takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup Extra Cab, RWD, Standard, MSG5C takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup Extra Cab, RWD, Standard, MUA5C takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup, 2.6 E, 4WD takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup, 2.6 E, RWD, Automatic takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup, 2.6 E, RWD, Standard, MSG5C takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup, 2.6 E, RWD, Standard, MUA5C takes 5W-20 (5.2 quarts qt with filter); the LS, 2D Pickup, 3.1 Z takes 5W-20 (4.5 quarts qt with filter); the S, 2.3 L, MSG5C takes 5W-20 (4.2 quarts qt with filter); the S, 2.3 L, MUA5C takes 5W-20 (4.2 quarts qt with filter); the S, 3.1 Z takes 5W-20 (4.5 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 1 Ton, MSG5C: 5W-20, 5.2 quarts with filter
- 1 Ton, MUA5C: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup Extra Cab, 4WD: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup Extra Cab, RWD, Automatic: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup Extra Cab, RWD, Standard, MSG5C: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup Extra Cab, RWD, Standard, MUA5C: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup, 2.6 E, 4WD: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup, 2.6 E, RWD, Automatic: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup, 2.6 E, RWD, Standard, MSG5C: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup, 2.6 E, RWD, Standard, MUA5C: 5W-20, 5.2 quarts with filter
- LS, 2D Pickup, 3.1 Z: 5W-20, 4.5 quarts with filter
- S, 2.3 L, MSG5C: 5W-20, 4.2 quarts with filter
- S, 2.3 L, MUA5C: 5W-20, 4.2 quarts with filter
- S, 3.1 Z: 5W-20, 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 1 Ton, MSG5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| 1 Ton, MUA5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup Extra Cab, 4WD — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup Extra Cab, RWD, Automatic — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup Extra Cab, RWD, Standard, MSG5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup Extra Cab, RWD, Standard, MUA5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup, 2.6 E, 4WD — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup, 2.6 E, RWD, Automatic — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup, 2.6 E, RWD, Standard, MSG5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup, 2.6 E, RWD, Standard, MUA5C — 2.6L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 5.20 QTS. | 4.80 QTS. | — |
| LS, 2D Pickup, 3.1 Z — 3.1L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| S, 2.3 L, MSG5C — 2.3L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 4.20 QTS. | 3.80 QTS. | — |
| S, 2.3 L, MUA5C — 2.3L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 4.20 QTS. | 3.80 QTS. | — |
| S, 3.1 Z — 3.1L Eng | API - SAE 5W-20 (Below 20Deg.F), 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F), 20W-20/40 (Above 20Deg.F), 30 (Above 40Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
Complete Oil Change Bundle for 1991 Isuzu Pickup
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Buy the right oil & filter for your Pickup
🛒 Buy 5W-20 Full Synthetic Oil (5.2 quarts needed) on Amazon💡 Capacity Note: Your 1991 Isuzu Pickup holds 5.2 quarts with filter. Since standard jugs are 5 quarts, be sure to pick up extra 1-quart bottles or a 2-pack to reach the full mark on the dipstick.
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More factory specs & repair guides for your Pickup
🛞 1991 Isuzu Pickup Tire Size & Pressure →🌧️ 1991 Isuzu Pickup Wiper Blade Sizes →💡 1991 Isuzu Pickup Light Bulb Sizes →📖 1991 Isuzu Pickup Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
9.5 quarts (8.99 L) — 50/50 mixture of Ethylene Glycol Antifreeze and water
Frequently asked questions
What type of oil does a 1991 Isuzu Pickup take?
It depends on the engine: 1 Ton, MSG5C uses 5W-20; 1 Ton, MUA5C uses 5W-20; LS, 2D Pickup Extra Cab, 4WD uses 5W-20; LS, 2D Pickup Extra Cab, RWD, Automatic uses 5W-20; LS, 2D Pickup Extra Cab, RWD, Standard, MSG5C uses 5W-20; LS, 2D Pickup Extra Cab, RWD, Standard, MUA5C uses 5W-20; LS, 2D Pickup, 2.6 E, 4WD uses 5W-20; LS, 2D Pickup, 2.6 E, RWD, Automatic uses 5W-20; LS, 2D Pickup, 2.6 E, RWD, Standard, MSG5C uses 5W-20; LS, 2D Pickup, 2.6 E, RWD, Standard, MUA5C uses 5W-20; LS, 2D Pickup, 3.1 Z uses 5W-20; S, 2.3 L, MSG5C uses 5W-20; S, 2.3 L, MUA5C uses 5W-20; S, 3.1 Z uses 5W-20.
What is the oil capacity of a 1991 Isuzu Pickup?
Oil capacity depends on the engine: 1 Ton, MSG5C holds 5.2 quarts with filter; 1 Ton, MUA5C holds 5.2 quarts with filter; LS, 2D Pickup Extra Cab, 4WD holds 5.2 quarts with filter; LS, 2D Pickup Extra Cab, RWD, Automatic holds 5.2 quarts with filter; LS, 2D Pickup Extra Cab, RWD, Standard, MSG5C holds 5.2 quarts with filter; LS, 2D Pickup Extra Cab, RWD, Standard, MUA5C holds 5.2 quarts with filter; LS, 2D Pickup, 2.6 E, 4WD holds 5.2 quarts with filter; LS, 2D Pickup, 2.6 E, RWD, Automatic holds 5.2 quarts with filter; LS, 2D Pickup, 2.6 E, RWD, Standard, MSG5C holds 5.2 quarts with filter; LS, 2D Pickup, 2.6 E, RWD, Standard, MUA5C holds 5.2 quarts with filter; LS, 2D Pickup, 3.1 Z holds 4.5 quarts with filter; S, 2.3 L, MSG5C holds 4.2 quarts with filter; S, 2.3 L, MUA5C holds 4.2 quarts with filter; S, 3.1 Z holds 4.5 quarts with filter.
How often should I change the oil in my 1991 Isuzu Pickup?
Most 1991 Isuzu Pickup 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 — Isuzu recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Isuzu Pickup?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Isuzu Pickup. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.