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Lol your question will never get a short answer. Find out what ford recommend for your climate they did build it. Oil is always dependent on the climate where you live. Here in Australia we have a hot climate and ford recommend Castro edge 5w30. So that's what I use
 

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It recommends 5w.-20 where I am in th US. I think I am going to run 5w-30 Repsol. Since they only make 5-30...jerks.. I think I am going to mix it down to 5w-25 with some good other synthetic.
 

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Just something to consider, Ford used Motorcraft Synthetic Blend 5w-30 in the F150 "Hero" Ecoboost motor. This is the motor that had the equivalent to 160k miles before running in a Raptor in the Baja 1000. Then they did a live teardown at an auto show. Pretty impressive.
 

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after my 1st free oil change from the dealer I plan to run. Mobil 1 extended performance 5w-20 or 5w-30 with a motorcraft oil filter.
 

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As long as they are both full synthetic - barring a few things - it's fine. I can give you a jackload of paperwork if you want it.

You have to be pretty particular about mixing them and watch the weighting. You obviously wouldn't want to mix something outside the weight range.

It's ideal if you have the same manufacturers oil to mix, but as Repsol doesn't have anything close. I will have to use something else very high grade.
 

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5w20 is only recommended in the US for mileage concerns. This is because the auto industry is trying to eek out every last mpg to satisfy the epa.
This is true everywhere these days. but remember bearing tolerances are designed around specified oil as well. And if your motor spins a big end or something ford will most likely send an oil sample off to a lab for analysis and if it's the wrong oil no warranty!
 

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I was told by a warranty specialist that running synthetic oil in the proper weight (5w20 to 5w30) would not cause any issues with the warranty as long as you actually change it within a reasonable interval (which I think 10k is the max). I plan to run Mobil 1 Synthetic after the free oil change.
 
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