All three Cadillac CTS and CTS-V cars require SAE 5W-30 engine oil. Although it specifies no particular brand,Cadillac recommends Dexos-certified oils that bear the Dexos mark; Dexos is an oil-rating standard used by many automakers. If you plan to drive the car in extreme cold (-29 Celsius/-20 Fahrenheit), use 0W-30 oil
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