Another one.. '18 Head Gasket
Welp, add me to the list. 2018 Chrysler Pacifica Limited bought used with 30K 6 years ago now at 73K. Cylinder 1 misfire, running sluggish and a little rough at idle. Stopped using it and pulled plug 1 and checked cylinder 1 to find a small amount of coolant inside the cylinder. Coolant reservoir was bit low. Put Blue Devil pour and go head gasket sealer hoping to keep this one running for a while. Looks to have worked. Check engine light has stayed off this week but still a bit rough at idle and acceleration.
Changed plugs and coils, all plugs looked like dog crap, cylinder 1 & 2 looked to be burning coolant. After gasket sealer cylinders 1 and 2 are both coolant free. Changed coolant reservoir, cleaned intake manifold, throttle body and EGR which looked pretty bad. Put 0W20 Valvoline Restore and Protect and a bottle of Techron fuel system cleaner and she purrs like a kitten, super smooth idle and acceleration. Coolant temps running 210-230, which I don't like so I'll be changing the thermostat this week.
Moral of the story... Stay on top of maintenance and try and be pro active. Do the spark plugs and coils early and check for any active head gasket leaks.
Fortunately I didn't't have any smoking from tail pipe, or frothy l chocote milk oil, so I believe in my case the gasket sealer has helped. Of course it's a temporary fix until I can drop a Hellcat engine into this thing lol 🤣