The 2005 GMC sierra 1500 oil type and capacity iS5w30 and 6 quarts. Having high quality oil is important for the engine to run smoothly. You will run into issues with the oil at some point. Bad oil can cause the engine to stop working. A common problem is an awful burning smell. This needs to be inspected as soon as possible or the car might explode. Knocking noise may arise from the engine. You could experience poor gas mileage. Your oil needs to be replaced eventually. Every 5,000 to 10,000 miles is a good rule of thumb. If You don't replace it, there will be issues with the engine.
John A.
January 2, 2020
All available engines in the 2005 GMC Sierra 1500 and 1500 HD all take 5W30 synthetic formatted oil. The 2005 Sierra 1500 HD only comes with the 6.0L V8 engine which uses 6 quarts. The 2005 Sierra 1500 has multiple engine options: the 4.3L V6 base (4.5 quarts), the 4.8L V8 optional (6 quarts), the four versions of the 5.3L V8 engine option ( engine code [B] B, [T] D, [T] T, and [Z] L59 Z Flex)(6 quarts), and the 6.0L V8 (6 quarts).
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