Honestly I wouldn't know what 'normal' maintenance for a GP or any vehicle small than a 2500 truck. With every vehicle it's different and also the fact that I'm not a car person. Gas engines are different compared to diesels which is mainly what i know how to fix. My go to person about cars was my brother but he unfortunately passed away at 22 on his way to work.
I wouldn't never use a cleaner that is made or specifically uses another name on a different part. If it's not made for what I need it for then I'm using it.
Before I fixed the radiator I had a code for oxygen sensor 2 but after I connected the battery afterwards i no longer have it. Which the code was insufficient active. So with what you're saying and that O2 code I'm wondering if a wire is shorting out, broken or cracked within the engine wiring harness or the ECM.
Another thing what is normal temperature gauge reading? Mine usually sits under the big 2nd mark between the top 2 smaller ones the whole time I'm driving. Then when I'm at a stop light or going 30 and under it goes between that same big mark and 210 til I go back to speeds above 45mph. Does that sound normal to you? Cause it doesn't to me but that's my opinion.
Appreciate the help tho!
