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I have watching videos of certified ford mechanics voicing their opinions of Ecoboost engines. Nearly all have stated change your oil more frequently than the manual states. They stated engines get varnish build-up on the engine internals. Because of synthetic oil extended recommendations, & because they are turbo-charged engines. "Oil is Oil" the mechanics said. That said oil is full of contaminants being recirculated through out your engine, for a longer period of time. So just get rid of it. Your engine will like you for it. They were talking about ecoboost 3.5 engines with 200k miles or more they were rebuilding. OIL is the key. Plus being aware the cam chains and guides on the v-6 ecoboost. I haven't looked yet about the 2.0 ecoboost. I personally have never let my engine oil change go longer than 3 thousand miles. Your thoughts, experience, Ecoboost owners?