1990 Mazda RX-7 Oil Type & Capacity: 5W-30 (4.88 quarts)
The 1990 Mazda RX-7 takes 5W-30 motor oil — 4.88 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.88 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| Base, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GTU, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GTU, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GTUs, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GTUs, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GXL, Automatic | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| GXL, Standard | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
| Turbo | API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F) | 4.88 QTS. | 4.70 QTS. | — |
More factory specs & repair guides for your RX-7
🛞 1990 Mazda RX-7 Tire Size & Pressure →🌧️ 1990 Mazda RX-7 Wiper Blade Sizes →💡 1990 Mazda RX-7 Light Bulb Sizes →📖 1990 Mazda RX-7 Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
9.2 quarts (8.7 L) — Ethylene Glycol Antifreeze Coolant
Frequently asked questions
What type of oil does a 1990 Mazda RX-7 take?
The 1990 Mazda RX-7 takes 5W-30 motor oil (API - SAE 5W-30 (Below -20Deg.F to 35Deg.F), 10W-30 (Below -10Deg.F to Above 85Deg.F) 10W-40, 10W-50 (Below -10Deg.F to Above 120Deg.F) 20W-40, 20W-50 (Below 10Deg.F to Above 120Deg.F)), per the factory service manual.
What is the oil capacity of a 1990 Mazda RX-7?
The 1990 Mazda RX-7 oil capacity is 4.88 quarts with a filter change, or 4.7 quarts without changing the filter.
How often should I change the oil in my 1990 Mazda RX-7?
Most 1990 Mazda RX-7 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 1990 Mazda RX-7?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Mazda RX-7. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.