MIDAS SAYS I NEED SYNTHETIC OIL IN MY 2008 DTS
GM recommends a Synthetic blend 5W-30: dexos1. Any brand will be fine, and Full Synthetic would be better but not necessary.
Tom is right. In most all cases, a synthetic blend is the preferred choice. An exception would be a high mileage car. In that case, you may want to avoid full synthetic.
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