My brother has a 2013 f 150 Harley with the 6.2 32,000 miles. A month ago we installed a K&N drop in. A week ago, it didn't want to turn over but after a few starts it did.
Today he drove from Orlando to Gainesville and as he pulled into the parking lot by the game it said low oil pressure right before he shut it off. 3 hours later it won't turn over. Any ideas??

 

check fuse 27 in the fuse box near the battery for signs of overheating. listen to the fuel pump when first turning on the truck does it make a buzzing sound before the truck starts to crank. any codes?

 

Describe in more detail what won't turn over means. Will it crank and not fire or will it not spin at all? He's still under warranty with roadside assistance. Let FoMoCo deal with it. That low oil pressure light is cause for real concern.