Knock on startup that goes away?

I have a 2014 Mustang GT with 4k miles. After the first oil change, I noticed a knock during warm startups. It goes away right away and I already had Ford check the oil filter and levels. One of their techs told me that the 5.4L do the same thing. They said with the variable cam timing it can cause the oil pressure to drop. This being said, getting a dry start occasionally. They said I have nothing to worry about and if it happens to get worse to bring it back in for tear down. I want to know if there are any other 5.0 owners out there that have the same thing happening. If so, what happened with yours? Any other advice is also welcome.

WHOA. "Nothing to worry about"… And bring it back for a TEAR DOWN? Did you get that statement in WRITING?!

After reading about the 5.4l in which the f150s used one gentleman had the same dilemma. He replaced the cam phasers only to have the problem come back. A few 5.4l owners had done the same. It turns out the timing chain guide was broken causing the chain to slap around in the timing cover. He replaced these parts but programed the vehicle to not use cam phasers. Now he has a steady oil pressure both hot and cold. And claims it is the quietest 4.3l h's seen.

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