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The 2015 Ford Expedition comes with a 3.5 L V6 engine, and the manufacturer recommends using a synthetic SAE 5W-30 oil. Whether you choose full synthetic or a blend, they both offer better engine protection compared to conventional oil. While conventional oil is still suitable for use, using synthetic oil can provide extra engine protection and possibly improve fuel efficiency. The key is to regularly change the oil, typically every 5,000 miles with conventional oil or around 7,500 miles with synthetic.
The 3.5L V6 engine in the 2015 Ford Expedition runs on SAE synthetic blend 5W-30 motor oil and holds 5.7 quarts of oil when changing the filter.