2015 4.0 piston slap

I am running the one that Valvoline put in I’m just assuming is not a very good one because it’s a drive-through or change place. Thinking about putting a wix or OEM - also to the poster before this one. I think it is 5w

 

Sounds to me like your not letting the truck warm up on a cold start, regardless of the temp these engines like to be warmed up before trowing it into gear (IMO). I go 3-5 mins in the summer and a full 10 minutes in the winter.

If that doesn't help try running full synthetic and 93 fuel.

The 4.0 is noisy, roll the window up.

 

what temperature is considered warmed up?

 

My 06 4.0L developed a loud rattle/knock until it reached full temp. First noticed it at 110,000mi. Couldn't find an issue, assumed it was piston slap and traded it in at 160,000mi for a pittance. I couldn't bring myself to sell it privately with obvious issues (frame was rusty too). So much for resale and reliability.

 

LOL I can hear it from the cab. I just got the oil changed today with penzoil conventional and put a wix filter on it.