Kirkland 5w-30, 13k miles, Chrysler Sebring 2.7l, 153k miles

The only "relatively good" OCI was the 9500 mile one. I really don't understand your criteria for further extending from there, and the results weren't very good, yet you kept on with it. Maybe TBN alone was the only consideration? I dunno, but I'd try a reset at 5K personally with the R&P. And check your air filter along with the rest of the intake hoses.
 
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