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It depends on the engine. For the 4.3 V6, ~5 quarts (4.5 with the small oil filter, 5 with the big one). The 4.8 , 5.3, and 6.0 V8 should all be ~6 quarts. The 8.1 V8 should be between 6.5 and 7 quarts, depending on the filter. The LB7 series of the Duramax 6.6 diesel is listed as 10 quarts with filter, but can vary by a half quart.GM's gas engines recommend 5W-30, regardless of mileage. You can add some Lucas to it if you need to.

For the diesel engines, it needs to be diesel oil specifically. 15W-40 is commonly used as an 'all around' oil. Depending on the climate where you live, you may want to go with a lighter weight (colder environments) or heavier weight (hotter environments).

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7y ago
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7y ago

Need to know which engine it has and the climate you live in. It's best to consult the owners manual for that info.

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6y ago

Duramax uses 15W40

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Q: How much oil and type of oil does a 2002 GMC Sierra truck take with miles over 100000 miles?
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