General Description
Notice: Use engine oil that is identified as meeting standard GM6094M and showing the American Petroleum Institute (API) starburst symbol. Failure to use the recommended oil can result in engine damage and will void the engine warranty.
When determining the type of engine oil to use, look for the following items.
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Use only an oil that meets standard GM6094M.
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Oil grade SAE 5W–30 is best for the engine. Do not use SAE 10W–40 or 20W–50.
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The API starburst symbol. See figure .
Fig. 1, API Symbol
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The Dexos 1 Approved-Gen 2 symbol ( for 6.6 L engines). See figure .
Fig. 2, Dexos 1 Approved-Gen 2 Symbol (for 6.6 L engines)
If the vehicle is being operated in an area of extreme cold, the use of SAE 5W–30 oil will provide easier cold starting for the engine.