* Maintenance: Regular oil changes, proper fluid levels, and timely repairs are crucial. Neglecting maintenance will drastically shorten its lifespan.
* Driving habits: Aggressive driving, frequent towing heavy loads, or consistently running the engine at high RPMs will wear it down faster.
* Operating conditions: Extreme temperatures, dusty environments, or frequent stop-and-go traffic can all contribute to faster wear.
* Specific vehicle and application: The engine's longevity will differ based on the vehicle it's in (truck, SUV, etc.) and how it's used.
With proper maintenance and moderate driving habits, a 5.4L engine *could* potentially last 200,000 miles or more. However, it's not uncommon for some to reach 300,000 miles or even beyond, while others might fail much sooner due to the factors listed above. There's no single definitive answer.
