2008 Pontiac G8 Oil Type & Capacity
The 2008 Pontiac G8 oil type depends on the engine: the Base takes 5W-30 (6.9 quarts qt with filter); the GT takes 5W-30 (8.8 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base: 5W-30, 6.9 quarts with filter
- GT: 5W-30, 8.8 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base — 3.6L Eng | API - SAE 5W-30 | 6.90 QTS. | — | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
| GT — 6.0L Eng | API - SAE 5W-30 | 8.80 QTS. | — | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
More factory specs & repair guides for your G8
🛞 2008 Pontiac G8 Tire Size & Pressure →🌧️ 2008 Pontiac G8 Wiper Blade Sizes →💡 2008 Pontiac G8 Light Bulb Sizes →📖 2008 Pontiac G8 Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.6 quarts (10.03 L) — 50/50 mixture of DEX-COOL and clean, drinkable water. All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling.
Frequently asked questions
What type of oil does a 2008 Pontiac G8 take?
It depends on the engine: Base uses 5W-30; GT uses 5W-30.
What is the oil capacity of a 2008 Pontiac G8?
Oil capacity depends on the engine: Base holds 6.9 quarts with filter; GT holds 8.8 quarts with filter.
How often should I change the oil in my 2008 Pontiac G8?
Most 2008 Pontiac G8 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 — Pontiac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 2008 Pontiac G8?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2008 Pontiac G8. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.