What type of oil does my CTS/ CTS-V use?

Both the CTS and CTS-V require SYNTHETIC engine oil... here is what it says in the Owners manual:

and here is a warning from the manual:

I recommend Mobil 1. Its what they put in at the factory and its almost everywhere (walmart and costco too). It is also relativly inexpensive. Other synthetics that some use are Castrol Sythtec.

Oil Weight depends on your car and location in he country. However, 5-30 is recommended. Here is the manual:

And here is a chart you can use to select alternative viscosity oils if you live in parts of the country that get colder.

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