1985 Jeep Grand Wagoneer Oil Type & Capacity
The 1985 Jeep Grand Wagoneer oil type depends on the engine: the 4.2 C, Automatic takes 5W-30 (6.0 quarts qt with filter); the 4.2 C, Standard takes 5W-30 (6.0 quarts qt with filter); the 5.9 N, Automatic takes 5W-30 (5.0 quarts qt with filter); the 5.9 N, Standard takes 5W-30 (5.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 4.2 C, Automatic: 5W-30, 6.0 quarts with filter
- 4.2 C, Standard: 5W-30, 6.0 quarts with filter
- 5.9 N, Automatic: 5W-30, 5.0 quarts with filter
- 5.9 N, Standard: 5W-30, 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 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 — 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. | — | — |
| 5.9 N, Automatic — 5.9L 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) | 5.00 QTS. | — | — |
| 5.9 N, Standard — 5.9L 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) | 5.00 QTS. | — | — |
More factory specs & repair guides for your Grand Wagoneer
🛞 1985 Jeep Grand Wagoneer Tire Size & Pressure →🌧️ 1985 Jeep Grand Wagoneer Wiper Blade Sizes →💡 1985 Jeep Grand Wagoneer Light Bulb Sizes →📖 1985 Jeep Grand Wagoneer Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.5 quarts (9.93 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water
Frequently asked questions
What type of oil does a 1985 Jeep Grand Wagoneer take?
It depends on the engine: 4.2 C, Automatic uses 5W-30; 4.2 C, Standard uses 5W-30; 5.9 N, Automatic uses 5W-30; 5.9 N, Standard uses 5W-30.
What is the oil capacity of a 1985 Jeep Grand Wagoneer?
Oil capacity depends on the engine: 4.2 C, Automatic holds 6.0 quarts with filter; 4.2 C, Standard holds 6.0 quarts with filter; 5.9 N, Automatic holds 5.0 quarts with filter; 5.9 N, Standard holds 5.0 quarts with filter.
How often should I change the oil in my 1985 Jeep Grand Wagoneer?
Most 1985 Jeep Grand Wagoneer 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 1985 Jeep Grand Wagoneer?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1985 Jeep Grand Wagoneer. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.