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Is the Expedition's 3.5L EcoBoost engine reliable over the long term?
The second-generation 3.5L EcoBoost (2017+) installed in the Expedition is substantially more refined than the 2011-2016 version. Early timing chain and oil pan issues were corrected, and with oil changes every 8,000 km using 5W-30 full synthetic, these engines routinely exceed 300,000 km. Spark plugs should be replaced at 100,000 km, and the turbochargers warrant closer attention beyond 200,000 km, but early failures are uncommon. For buyers who tow an RV or a boat regularly, the 3.5L EcoBoost delivers considerably more low-end torque than the 5.0L Coyote V8 found in the F-150, making it the right engine for an Expedition working at its full rated capacity.