1991 Porsche 911 Oil Type & Capacity
The 1991 Porsche 911 oil type depends on the engine: the Carrera 2, 2D Convertible, Automatic takes 15W-40 (9.5 quarts qt with filter); the Carrera 2, 2D Convertible, Standard takes 15W-40 (9.5 quarts qt with filter); the Carrera 2, 2D Coupe, Automatic takes 15W-40 (9.5 quarts qt with filter); the Carrera 2, 2D Coupe, Standard takes 15W-40 (9.5 quarts qt with filter); the Carrera 4, 2D Convertible takes 15W-40 (9.5 quarts qt with filter); the Carrera 4, 2D Coupe takes 15W-40 (9.5 quarts qt with filter); the Turbo takes 15W-40 (10.6 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Carrera 2, 2D Convertible, Automatic: 15W-40, 9.5 quarts with filter
- Carrera 2, 2D Convertible, Standard: 15W-40, 9.5 quarts with filter
- Carrera 2, 2D Coupe, Automatic: 15W-40, 9.5 quarts with filter
- Carrera 2, 2D Coupe, Standard: 15W-40, 9.5 quarts with filter
- Carrera 4, 2D Convertible: 15W-40, 9.5 quarts with filter
- Carrera 4, 2D Coupe: 15W-40, 9.5 quarts with filter
- Turbo: 15W-40, 10.6 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Carrera 2, 2D Convertible, Automatic — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Carrera 2, 2D Convertible, Standard — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Carrera 2, 2D Coupe, Automatic — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Carrera 2, 2D Coupe, Standard — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Carrera 4, 2D Convertible — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Carrera 4, 2D Coupe — 3.6L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 9.50 QTS. | — | Manufacturer's approved fluid only. |
| Turbo — 3.3L Eng | API - SF/CC, SF/CD, SG/CC or SG/CD, SAE 15W-40, 20W-50/40 (Above 50Deg.F), SAE 15W-40, 10W-40/30 (Below 50Deg.F), SAE 10W-30 and 5W-30 (Below 14Deg.F) | 10.60 QTS. | — | Manufacturer's approved fluid only. |
Complete Oil Change Bundle for 1991 Porsche 911
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More factory specs & repair guides for your 911
🛞 1991 Porsche 911 Tire Size & Pressure →🌧️ 1991 Porsche 911 Wiper Blade Sizes →💡 1991 Porsche 911 Light Bulb Sizes →📖 1991 Porsche 911 Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Frequently asked questions
What type of oil does a 1991 Porsche 911 take?
It depends on the engine: Carrera 2, 2D Convertible, Automatic uses 15W-40; Carrera 2, 2D Convertible, Standard uses 15W-40; Carrera 2, 2D Coupe, Automatic uses 15W-40; Carrera 2, 2D Coupe, Standard uses 15W-40; Carrera 4, 2D Convertible uses 15W-40; Carrera 4, 2D Coupe uses 15W-40; Turbo uses 15W-40.
What is the oil capacity of a 1991 Porsche 911?
Oil capacity depends on the engine: Carrera 2, 2D Convertible, Automatic holds 9.5 quarts with filter; Carrera 2, 2D Convertible, Standard holds 9.5 quarts with filter; Carrera 2, 2D Coupe, Automatic holds 9.5 quarts with filter; Carrera 2, 2D Coupe, Standard holds 9.5 quarts with filter; Carrera 4, 2D Convertible holds 9.5 quarts with filter; Carrera 4, 2D Coupe holds 9.5 quarts with filter; Turbo holds 10.6 quarts with filter.
How often should I change the oil in my 1991 Porsche 911?
Most 1991 Porsche 911 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 — Porsche recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Porsche 911?
Yes. 15W-40 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Porsche 911. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.