2008 GMC Cab & Chassis Sierra Oil Type & Capacity
The 2008 GMC Cab & Chassis Sierra oil type depends on the engine: the 2D Pickup, 6.0 K, 4WD takes 5W-30 (6.0 quarts with filter); the 2D Pickup, 6.0 K, RWD takes 5W-30 (6.0 quarts with filter); the 2D Pickup, 6.6 6, 4WD takes 15W-40 (10.0 quarts with filter); the 2D Pickup, 6.6 6, RWD takes 15W-40 (10.0 quarts with filter); the 4D Pickup Extra Cab, 6.0 K, 4WD takes 5W-30 (6.0 quarts with filter); the 4D Pickup Extra Cab, 6.0 K, RWD takes 5W-30 (6.0 quarts with filter); the 4D Pickup Extra Cab, 6.6 6, 4WD takes 15W-40 (10.0 quarts with filter); the 4D Pickup Extra Cab, 6.6 6, RWD takes 15W-40 (10.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 2D Pickup, 6.0 K, 4WD: 5W-30, 6.0 quarts with filter
- 2D Pickup, 6.0 K, RWD: 5W-30, 6.0 quarts with filter
- 2D Pickup, 6.6 6, 4WD: 15W-40, 10.0 quarts with filter
- 2D Pickup, 6.6 6, RWD: 15W-40, 10.0 quarts with filter
- 4D Pickup Extra Cab, 6.0 K, 4WD: 5W-30, 6.0 quarts with filter
- 4D Pickup Extra Cab, 6.0 K, RWD: 5W-30, 6.0 quarts with filter
- 4D Pickup Extra Cab, 6.6 6, 4WD: 15W-40, 10.0 quarts with filter
- 4D Pickup Extra Cab, 6.6 6, RWD: 15W-40, 10.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 2D Pickup, 6.0 K, 4WD — 6.0L Eng | API - SAE 5W-30 | 6.00 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. |
| 2D Pickup, 6.0 K, RWD — 6.0L Eng | API - SAE 5W-30 | 6.00 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. |
| 2D Pickup, 6.6 6, 4WD — 6.6L Eng | API - SAE 15W-40 | 10.00 QTS. | 9.20 QTS. | Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. |
| 2D Pickup, 6.6 6, RWD — 6.6L Eng | API - SAE 15W-40 | 10.00 QTS. | 9.20 QTS. | Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. |
| 4D Pickup Extra Cab, 6.0 K, 4WD — 6.0L Eng | API - SAE 5W-30 | 6.00 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. |
| 4D Pickup Extra Cab, 6.0 K, RWD — 6.0L Eng | API - SAE 5W-30 | 6.00 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. |
| 4D Pickup Extra Cab, 6.6 6, 4WD — 6.6L Eng | API - SAE 15W-40 | 10.00 QTS. | 9.20 QTS. | Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. |
| 4D Pickup Extra Cab, 6.6 6, RWD — 6.6L Eng | API - SAE 15W-40 | 10.00 QTS. | 9.20 QTS. | Use ONLY engine oils that have one of these designations: CI-4 or CH-4 for DURAMAX diesel engines. When it is very cold, below 0Deg. F (-18Deg.C), you should use SAE 5W-40 to improve cold starting. Do not use other viscosity such as SAE 10W-30, SAE 10W-40, or SAE 20W-50. |
Buy the right oil
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More specs & repair guides for your Cab & Chassis Sierra
2008 GMC Cab & Chassis Sierra factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
16.8 quarts (15.89 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 GMC Cab & Chassis Sierra take?
It depends on the engine: 2D Pickup, 6.0 K, 4WD uses 5W-30; 2D Pickup, 6.0 K, RWD uses 5W-30; 2D Pickup, 6.6 6, 4WD uses 15W-40; 2D Pickup, 6.6 6, RWD uses 15W-40; 4D Pickup Extra Cab, 6.0 K, 4WD uses 5W-30; 4D Pickup Extra Cab, 6.0 K, RWD uses 5W-30; 4D Pickup Extra Cab, 6.6 6, 4WD uses 15W-40; 4D Pickup Extra Cab, 6.6 6, RWD uses 15W-40.
How much oil does a 2008 GMC Cab & Chassis Sierra take?
Capacity depends on the engine: 2D Pickup, 6.0 K, 4WD holds 6.0 quarts with filter; 2D Pickup, 6.0 K, RWD holds 6.0 quarts with filter; 2D Pickup, 6.6 6, 4WD holds 10.0 quarts with filter; 2D Pickup, 6.6 6, RWD holds 10.0 quarts with filter; 4D Pickup Extra Cab, 6.0 K, 4WD holds 6.0 quarts with filter; 4D Pickup Extra Cab, 6.0 K, RWD holds 6.0 quarts with filter; 4D Pickup Extra Cab, 6.6 6, 4WD holds 10.0 quarts with filter; 4D Pickup Extra Cab, 6.6 6, RWD holds 10.0 quarts with filter.
Can I use synthetic oil in my 2008 GMC Cab & Chassis Sierra?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2008 GMC Cab & Chassis Sierra. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.