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The 2011 GMC Sierra 1500 requires 5w-30 oil with a capacity of 4.5 quarts. It's important to change the oil every 5,000 to 10,000 miles to prevent engine issues. Using high-quality oil is crucial for optimal engine performance. Neglecting oil changes can lead to engine failure, indicated by a burning smell and decreased gas mileage. Any knocking noise from the engine should be addressed promptly to avoid potential car damage.
The 2011 GMC Sierra 1500 takes SAE 5W-30 oil with the API Certification Seal. The 4.3L V6 engine requires 4.5 quarts (4.3 liters) of oil and the other engine options need 6 quarts (5.7 liters) in total.
I put Castro GTX 5w-30 full synthetic high mileage oil in my 2011 car, which has over 114,000 miles on it. We switch it out every 5,000 to 7,500 miles. I also mix in a quart of Lucas oil treatment during each oil change. After each change, the oil always looks clean. I suggest adding Lucas oil treatment with every oil change as it makes a noticeable difference.
I'm currently tied up, but I will do my utmost to return and respond to these questions later.
Anything dated after 2011 requires 5w30 full synthetic oil. It must be specified as DexOs1 to prevent potential problems down the line.