1991 Mitsubishi Montero Oil Type & Capacity: 20W-20 (5.5 quarts)
The 1991 Mitsubishi Montero takes 20W-20 motor oil — 5.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
20W-20 — 5.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base | API - SAE 20W-20/40/50 (32Deg.F to Above 120Deg.F), 10W-30/40/50 (-10Deg.F to Above 120Deg.F), 5W-30 (Below -20Deg.F to 60Deg.F) | 5.50 QTS. | 5.00 QTS. | — |
| LS, Automatic | API - SAE 20W-20/40/50 (32Deg.F to Above 120Deg.F), 10W-30/40/50 (-10Deg.F to Above 120Deg.F), 5W-30 (Below -20Deg.F to 60Deg.F) | 5.50 QTS. | 5.00 QTS. | — |
| LS, Standard | API - SAE 20W-20/40/50 (32Deg.F to Above 120Deg.F), 10W-30/40/50 (-10Deg.F to Above 120Deg.F), 5W-30 (Below -20Deg.F to 60Deg.F) | 5.50 QTS. | 5.00 QTS. | — |
| RS | API - SAE 20W-20/40/50 (32Deg.F to Above 120Deg.F), 10W-30/40/50 (-10Deg.F to Above 120Deg.F), 5W-30 (Below -20Deg.F to 60Deg.F) | 5.50 QTS. | 5.00 QTS. | — |
More factory specs & repair guides for your Montero
🛞 1991 Mitsubishi Montero Tire Size & Pressure →🌧️ 1991 Mitsubishi Montero Wiper Blade Sizes →💡 1991 Mitsubishi Montero Light Bulb Sizes →📖 1991 Mitsubishi Montero Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.0 quarts (9.46 L) — 50/50 mixture of Ethylene Glycol Antifreeze and water. Includes: .5 qt. for coolant reserve tank.
Frequently asked questions
What type of oil does a 1991 Mitsubishi Montero take?
The 1991 Mitsubishi Montero takes 20W-20 motor oil (API - SAE 20W-20/40/50 (32Deg.F to Above 120Deg.F), 10W-30/40/50 (-10Deg.F to Above 120Deg.F), 5W-30 (Below -20Deg.F to 60Deg.F)), per the factory service manual.
What is the oil capacity of a 1991 Mitsubishi Montero?
The 1991 Mitsubishi Montero oil capacity is 5.5 quarts with a filter change, or 5.0 quarts without changing the filter.
How often should I change the oil in my 1991 Mitsubishi Montero?
Most 1991 Mitsubishi Montero 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 — Mitsubishi recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Mitsubishi Montero?
Yes. 20W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Mitsubishi Montero. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.