1991 Mazda Navajo Oil Type & Capacity: 5W-30 (5.0 quarts)
The 1991 Mazda Navajo takes 5W-30 motor oil — 5.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| LX, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 120Deg.F) | 5.00 QTS. | — | — |
| LX, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 120Deg.F) | 5.00 QTS. | — | — |
| S, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 120Deg.F) | 5.00 QTS. | — | — |
| S, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 120Deg.F) | 5.00 QTS. | — | — |
More factory specs & repair guides for your Navajo
🛞 1991 Mazda Navajo Tire Size & Pressure →🌧️ 1991 Mazda Navajo Wiper Blade Sizes →💡 1991 Mazda Navajo Light Bulb Sizes →📖 1991 Mazda Navajo Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
8.6 quarts (8.13 L) — Ethylene Glycol Antifreeze Coolant
Frequently asked questions
What type of oil does a 1991 Mazda Navajo take?
The 1991 Mazda Navajo takes 5W-30 motor oil (API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 120Deg.F)), per the factory service manual.
What is the oil capacity of a 1991 Mazda Navajo?
The 1991 Mazda Navajo oil capacity is 5.0 quarts with a filter change.
How often should I change the oil in my 1991 Mazda Navajo?
Most 1991 Mazda Navajo 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 — Mazda recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Mazda Navajo?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Mazda Navajo. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.