My Coyote, burned oil in between that 10k to 20k mile period. I checked it one morning and it was low as hell. I went to Bill Utter Ford and had them put it on their Oil usage interval test. It didn't burn enough oil to warrant a new motor. It burned like half a quart the next 5k miiles, which seems to normal for these motors. I currently use Mobile 1 Advanced Full Synthetic and now I don't burn much if any at all at close to 35k. So original poster, change that oil every 5k bro. I wouldn't dare go 1 mile over 5k even though my oil is guranteed at 15k interval. Good luck on everything. At least you have paperwork proving your point.
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