I’ve tried 0w20 and 5w20 in this as well. It made the issue much much worse and the engine noises were enough for me to change back to thicker oil. On 40 grades the engine sounds much better especially at idle and when in a drive through. I also tow heavy and race the truck. So minimum spec isn’t really for me. Many engine builders and tuners are recommending 50 grades for these. I had the best success using rotella 5w40 in mine. But it’s getting hard to find and they keep raising the price. I’ve since moved to petro Canada uhp 0w40 and I’ve been quite happy with it so far. I can get it from their distributor and they always have lots of stock of it. Plus then I’m supporting local. So I’m in between using that or moving to the sheering motorcraft 5w50 for short intervals or something like amsoil which again is pricey and hard to get unless I sign up and get it delivered to my door.Why not just use the factory recommended oil viscosity? I personally know over a dozen folks with 5.0 coyote powered trucks and none of them have any VCT issues. I’m also friends with an ac repair guy who owns his own company. His fleet of F150’s all have the coyote and none have any VCT issues or noises. Most of them are serviced thru Ford dealerships and quick lube shops which I assume use the factory recommended oil viscosity. I highly doubt any of them have been filled with anything thicker than a 30 grade viscosity.