1990 Jeep Wrangler Oil Type & Capacity
The 1990 Jeep Wrangler oil type depends on the engine: the Base, 2.5 E takes 5W-30 (4.0 quarts qt with filter); the Base, 4.2 T, Automatic takes 5W-30 (6.0 quarts qt with filter); the Base, 4.2 T, Standard takes 5W-30 (6.0 quarts qt with filter); the Islander, 2.5 E takes 5W-30 (4.0 quarts qt with filter); the Islander, 4.2 T, Automatic takes 5W-30 (6.0 quarts qt with filter); the Islander, 4.2 T, Standard takes 5W-30 (6.0 quarts qt with filter); the Laredo, Automatic takes 5W-30 (6.0 quarts qt with filter); the Laredo, Standard takes 5W-30 (6.0 quarts qt with filter); the S takes 5W-30 (4.0 quarts qt with filter); the Sahara, 2.5 E takes 5W-30 (4.0 quarts qt with filter); the Sahara, 4.2 T, Automatic takes 5W-30 (6.0 quarts qt with filter); the Sahara, 4.2 T, Standard takes 5W-30 (6.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base, 2.5 E: 5W-30, 4.0 quarts with filter
- Base, 4.2 T, Automatic: 5W-30, 6.0 quarts with filter
- Base, 4.2 T, Standard: 5W-30, 6.0 quarts with filter
- Islander, 2.5 E: 5W-30, 4.0 quarts with filter
- Islander, 4.2 T, Automatic: 5W-30, 6.0 quarts with filter
- Islander, 4.2 T, Standard: 5W-30, 6.0 quarts with filter
- Laredo, Automatic: 5W-30, 6.0 quarts with filter
- Laredo, Standard: 5W-30, 6.0 quarts with filter
- S: 5W-30, 4.0 quarts with filter
- Sahara, 2.5 E: 5W-30, 4.0 quarts with filter
- Sahara, 4.2 T, Automatic: 5W-30, 6.0 quarts with filter
- Sahara, 4.2 T, Standard: 5W-30, 6.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 2.5 E — 2.5L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Base, 4.2 T, Automatic — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Base, 4.2 T, Standard — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Islander, 2.5 E — 2.5L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Islander, 4.2 T, Automatic — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Islander, 4.2 T, Standard — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Laredo, Automatic — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Laredo, Standard — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| S — 2.5L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Sahara, 2.5 E — 2.5L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Sahara, 4.2 T, Automatic — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
| Sahara, 4.2 T, Standard — 4.2L Eng | API - SAE 5W-30 (-20Deg.F to 60Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 6.00 QTS. | — | Use oil that has been certified by the American Petroleum Institute. |
More factory specs & repair guides for your Wrangler
🛞 1990 Jeep Wrangler Tire Size & Pressure →🌧️ 1990 Jeep Wrangler Wiper Blade Sizes →💡 1990 Jeep Wrangler Light Bulb Sizes →📖 1990 Jeep Wrangler Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
9.0 quarts (8.51 L) — 50/50 mixture of All Season Coolant and water. Includes: 1 qt. in coolant reserve tank.
Frequently asked questions
What type of oil does a 1990 Jeep Wrangler take?
It depends on the engine: Base, 2.5 E uses 5W-30; Base, 4.2 T, Automatic uses 5W-30; Base, 4.2 T, Standard uses 5W-30; Islander, 2.5 E uses 5W-30; Islander, 4.2 T, Automatic uses 5W-30; Islander, 4.2 T, Standard uses 5W-30; Laredo, Automatic uses 5W-30; Laredo, Standard uses 5W-30; S uses 5W-30; Sahara, 2.5 E uses 5W-30; Sahara, 4.2 T, Automatic uses 5W-30; Sahara, 4.2 T, Standard uses 5W-30.
What is the oil capacity of a 1990 Jeep Wrangler?
Oil capacity depends on the engine: Base, 2.5 E holds 4.0 quarts with filter; Base, 4.2 T, Automatic holds 6.0 quarts with filter; Base, 4.2 T, Standard holds 6.0 quarts with filter; Islander, 2.5 E holds 4.0 quarts with filter; Islander, 4.2 T, Automatic holds 6.0 quarts with filter; Islander, 4.2 T, Standard holds 6.0 quarts with filter; Laredo, Automatic holds 6.0 quarts with filter; Laredo, Standard holds 6.0 quarts with filter; S holds 4.0 quarts with filter; Sahara, 2.5 E holds 4.0 quarts with filter; Sahara, 4.2 T, Automatic holds 6.0 quarts with filter; Sahara, 4.2 T, Standard holds 6.0 quarts with filter.
How often should I change the oil in my 1990 Jeep Wrangler?
Most 1990 Jeep Wrangler 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 — Jeep recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1990 Jeep Wrangler?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Jeep Wrangler. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.