1990 Isuzu Trooper Oil Type & Capacity
The 1990 Isuzu Trooper oil type depends on the engine: the LS, 2.6 E, Automatic takes 5W-20 (5.2 quarts qt with filter); the LS, 2.6 E, Standard takes 5W-20 (5.2 quarts qt with filter); the LS, 2.8 R, Automatic takes 5W-20 (4.5 quarts qt with filter); the LS, 2.8 R, Standard takes 5W-20 (4.5 quarts qt with filter); the S, 2.6 E, Automatic takes 5W-20 (5.2 quarts qt with filter); the S, 2.6 E, Standard takes 5W-20 (5.2 quarts qt with filter); the S, 2.8 R, Automatic takes 5W-20 (4.5 quarts qt with filter); the S, 2.8 R, Standard takes 5W-20 (4.5 quarts qt with filter); the XS, 2.6 E, Automatic takes 5W-20 (5.2 quarts qt with filter); the XS, 2.6 E, Standard takes 5W-20 (5.2 quarts qt with filter); the XS, 2.8 R, Automatic takes 5W-20 (4.5 quarts qt with filter); the XS, 2.8 R, Standard takes 5W-20 (4.5 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- LS, 2.6 E, Automatic: 5W-20, 5.2 quarts with filter
- LS, 2.6 E, Standard: 5W-20, 5.2 quarts with filter
- LS, 2.8 R, Automatic: 5W-20, 4.5 quarts with filter
- LS, 2.8 R, Standard: 5W-20, 4.5 quarts with filter
- S, 2.6 E, Automatic: 5W-20, 5.2 quarts with filter
- S, 2.6 E, Standard: 5W-20, 5.2 quarts with filter
- S, 2.8 R, Automatic: 5W-20, 4.5 quarts with filter
- S, 2.8 R, Standard: 5W-20, 4.5 quarts with filter
- XS, 2.6 E, Automatic: 5W-20, 5.2 quarts with filter
- XS, 2.6 E, Standard: 5W-20, 5.2 quarts with filter
- XS, 2.8 R, Automatic: 5W-20, 4.5 quarts with filter
- XS, 2.8 R, Standard: 5W-20, 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| LS, 2.6 E, 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, 2.6 E, Standard — 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, 2.8 R, Automatic — 2.8L 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. | — |
| LS, 2.8 R, Standard — 2.8L 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, 2.6 E, 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. | — |
| S, 2.6 E, Standard — 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. | — |
| S, 2.8 R, Automatic — 2.8L 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, 2.8 R, Standard — 2.8L 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. | — |
| XS, 2.6 E, 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. | — |
| XS, 2.6 E, Standard — 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. | — |
| XS, 2.8 R, Automatic — 2.8L 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. | — |
| XS, 2.8 R, Standard — 2.8L 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. | — |
More factory specs & repair guides for your Trooper
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Coolant capacity
8.5 quarts (8.04 L) — 50/50 mixture of Ethylene Glycol Antifreeze and water
Frequently asked questions
What type of oil does a 1990 Isuzu Trooper take?
It depends on the engine: LS, 2.6 E, Automatic uses 5W-20; LS, 2.6 E, Standard uses 5W-20; LS, 2.8 R, Automatic uses 5W-20; LS, 2.8 R, Standard uses 5W-20; S, 2.6 E, Automatic uses 5W-20; S, 2.6 E, Standard uses 5W-20; S, 2.8 R, Automatic uses 5W-20; S, 2.8 R, Standard uses 5W-20; XS, 2.6 E, Automatic uses 5W-20; XS, 2.6 E, Standard uses 5W-20; XS, 2.8 R, Automatic uses 5W-20; XS, 2.8 R, Standard uses 5W-20.
What is the oil capacity of a 1990 Isuzu Trooper?
Oil capacity depends on the engine: LS, 2.6 E, Automatic holds 5.2 quarts with filter; LS, 2.6 E, Standard holds 5.2 quarts with filter; LS, 2.8 R, Automatic holds 4.5 quarts with filter; LS, 2.8 R, Standard holds 4.5 quarts with filter; S, 2.6 E, Automatic holds 5.2 quarts with filter; S, 2.6 E, Standard holds 5.2 quarts with filter; S, 2.8 R, Automatic holds 4.5 quarts with filter; S, 2.8 R, Standard holds 4.5 quarts with filter; XS, 2.6 E, Automatic holds 5.2 quarts with filter; XS, 2.6 E, Standard holds 5.2 quarts with filter; XS, 2.8 R, Automatic holds 4.5 quarts with filter; XS, 2.8 R, Standard holds 4.5 quarts with filter.
How often should I change the oil in my 1990 Isuzu Trooper?
Most 1990 Isuzu Trooper 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 1990 Isuzu Trooper?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Isuzu Trooper. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.