1991 Dodge Monaco Oil Type & Capacity: 5W-30 (6.0 quarts)
The 1991 Dodge Monaco takes 5W-30 motor oil — 6.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 6.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| ES, 3.0 3 | API - SAE 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F) | 6.00 QTS. | — | — |
| ES, 3.0 U | API - SAE 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F) | 6.00 QTS. | — | — |
| LE, 3.0 3 | API - SAE 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F) | 6.00 QTS. | — | — |
| LE, 3.0 U | API - SAE 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F) | 6.00 QTS. | — | — |
More factory specs & repair guides for your Monaco
🛞 1991 Dodge Monaco Tire Size & Pressure →🌧️ 1991 Dodge Monaco Wiper Blade Sizes →💡 1991 Dodge Monaco Light Bulb Sizes →📖 1991 Dodge Monaco Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
8.7 quarts (8.23 L) — 50/50 mixture of water and Ethylene-Glycol Base Antifreeze, such as MOPAR, PRESTON II, PEAK, or antifreeze containing the Alugard 340-2 inhibitor system.
Frequently asked questions
What type of oil does a 1991 Dodge Monaco take?
The 1991 Dodge Monaco takes 5W-30 motor oil (API - SAE 5W-30 (Below 60Deg.F), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1991 Dodge Monaco?
The 1991 Dodge Monaco oil capacity is 6.0 quarts with a filter change.
How often should I change the oil in my 1991 Dodge Monaco?
Most 1991 Dodge Monaco 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 — Dodge recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Dodge Monaco?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Dodge Monaco. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.