3500 mile an engine makes noise,
Go straight back the dealer,
Asked them to keep over cool night or weekend. Ask dealer to take an oil sample send it to the lab. They may attempt to make you pay for samples. ( I like agree but then make sure they agree to put an engine in when it comes back bad) asking see lab you’re self,
If still sad nothing wrong with it
Ask non dealers/ owner of 6.4 to listen to it,
Don’t put any additional or other they RAM requirements oil in it,
Ram used special oil made sure you are using it, an right weight.