Bought a 2019 1500 5.7 off the lot brand new 2.5 years ago. When I purchased the vehicle I asked the guy if I needed to use premium which I assumed and he assured me that these new trucks run fine on “regular”. Not reading the owners manual like I wish I would have I have been putting in “regular” since I bought the truck. Kicker, I live in Colorado and our regular is 85 octane. I started noticing a metal clinking sound that reminded me of two washers hitting each other when accelerating and hanging around 2500 RPMs. After having it looked at multiple times with nobody being able to find anything wrong I realized I’ve been using the wrong gas after searching for hours in the internet. I am going to switch to our premium which is 91 octane. Wondering if I caused any damage to the engine in 30k miles? Also is there an additive or something I can throw in a tank of gas that may help reverse any damage I’ve done? Other than the noise the truck seems to run great and I haven’t noticed any issues with power or anything but this sound has been driving me nuts. Thanks for any advice.