1986 Jeep CJ7 Oil Type & Capacity
The 1986 Jeep CJ7 oil type depends on the engine: the 2.5 U, T4 takes 5W-30 (4.0 quarts qt with filter); the 2.5 U, T5 takes 5W-30 (4.0 quarts qt with filter); the 4.2 C, Automatic takes 5W-30 (6.0 quarts qt with filter); the 4.2 C, Standard, T177 takes 5W-30 (6.0 quarts qt with filter); the 4.2 C, Standard, T4 takes 5W-30 (6.0 quarts qt with filter); the 4.2 C, Standard, T5 takes 5W-30 (6.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 2.5 U, T4: 5W-30, 4.0 quarts with filter
- 2.5 U, T5: 5W-30, 4.0 quarts with filter
- 4.2 C, Automatic: 5W-30, 6.0 quarts with filter
- 4.2 C, Standard, T177: 5W-30, 6.0 quarts with filter
- 4.2 C, Standard, T4: 5W-30, 6.0 quarts with filter
- 4.2 C, Standard, T5: 5W-30, 6.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 2.5 U, T4 — 2.5L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 4.00 QTS. | — | — |
| 2.5 U, T5 — 2.5L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 4.00 QTS. | — | — |
| 4.2 C, Automatic — 4.2L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 6.00 QTS. | — | — |
| 4.2 C, Standard, T177 — 4.2L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 6.00 QTS. | — | — |
| 4.2 C, Standard, T4 — 4.2L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 6.00 QTS. | — | — |
| 4.2 C, Standard, T5 — 4.2L Eng | API - SF, SAE 5W-30 (Below 60Deg.F), 10W-30 or 10W-40 (Above 0Deg.F), 20W-40 or 20W-50 (Above 30Deg.F) | 6.00 QTS. | — | — |
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More factory specs & repair guides for your CJ7
🛞 1986 Jeep CJ7 Tire Size & Pressure →🌧️ 1986 Jeep CJ7 Wiper Blade Sizes →💡 1986 Jeep CJ7 Light Bulb Sizes →📖 1986 Jeep CJ7 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 Ethylene Glycol Base Antifreeze and water
Frequently asked questions
What type of oil does a 1986 Jeep CJ7 take?
It depends on the engine: 2.5 U, T4 uses 5W-30; 2.5 U, T5 uses 5W-30; 4.2 C, Automatic uses 5W-30; 4.2 C, Standard, T177 uses 5W-30; 4.2 C, Standard, T4 uses 5W-30; 4.2 C, Standard, T5 uses 5W-30.
What is the oil capacity of a 1986 Jeep CJ7?
Oil capacity depends on the engine: 2.5 U, T4 holds 4.0 quarts with filter; 2.5 U, T5 holds 4.0 quarts with filter; 4.2 C, Automatic holds 6.0 quarts with filter; 4.2 C, Standard, T177 holds 6.0 quarts with filter; 4.2 C, Standard, T4 holds 6.0 quarts with filter; 4.2 C, Standard, T5 holds 6.0 quarts with filter.
How often should I change the oil in my 1986 Jeep CJ7?
Most 1986 Jeep CJ7 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 1986 Jeep CJ7?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1986 Jeep CJ7. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.