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The 2016 Buick LaCrosse requires SAE 5W-30 oil for its engine. Buick suggests using synthetic oil for each oil change. There are two primary types of oil available today: conventional, which has been used for years and is made from petroleum, and synthetic, a newer type designed to provide improved wear protection and longer intervals between changes. With synthetic oil, you can typically go 7,500 miles between changes, compared to 3,500 to 5,000 miles with conventional oil. I recommend checking your oil monthly to ensure that it is at the proper level and free of any debris.
I suggest utilizing 5W-30 synthetic oil for the 2016 Buick LaCrosse.