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 with filter); the 2.5 U, T5 takes 5W-30 (4.0 quarts with filter); the 4.2 C, Automatic takes 5W-30 (6.0 quarts with filter); the 4.2 C, Standard, T177 takes 5W-30 (6.0 quarts with filter); the 4.2 C, Standard, T4 takes 5W-30 (6.0 quarts with filter); the 4.2 C, Standard, T5 takes 5W-30 (6.0 quarts 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. | — | — |
Buy the right oil
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More specs & repair guides for your CJ7
1986 Jeep CJ7 factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site 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.
How much oil does a 1986 Jeep CJ7 take?
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.
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.