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Depending on how Your 2007 Chevrolet Silverado 2500HD is set up, you'll have a choice of three different engines. Your options are a 6.0L V8 gasoline engine, a larger 6.6L V8 diesel engine, or a supersized 8.1L V8 engine. Each of these engines requires different types of oil. Both gasoline engines need SAE 5W-30 full synthetic oil, though you can use SAE 5W-40 temporarily. The 6.0L engine needs 6.0 quarts of oil, while the 8.1L engine requires 6.4 quarts. The diesel engine, on the other hand, uses 10.0 quarts of SAE 15W-40 full synthetic diesel oil. You can also use SAE 5W-40 when it's very cold, below 0 degrees Fahrenheit. However, it's always best to stick with the oil type recommended by the manufacturer.
The recommended oil for a 2007 Chevy Silverado 2500HD is 5W-30.