What type of oil should I use for a 2009 Cadillac CTS?

According to Cadillac's guidelines, the recommended oil for the 2009 Cadillac CTS is 5w-30 full synthetic, unless you plan to drive in sub-zero temperatures reaching -20 Fahrenheit, in which case you will need 0W-30 oil. With a 3.6L V6 engine, the car will need about 6 quarts of oil during an oil change. Prices for oil can vary between $5 and $10, depending on the brand and quality, and it is advisable to use a Dexos-certified brand recommended by Cadillac. It is crucial to ensure the oil meets the GM4718M standard designation to avoid any potential engine damage that may not be covered by warranty. Regularly checking the oil levels by opening the hood, locating the yellow loop handle for the dipstick, pulling it out, and examining the oil level is essential.