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Did they enquire about your driving habits prior to suggesting a change interval? There's an association of napa dealers in CO who work with the local experts and provide classes on motor oil. They go over how to determine the change interval based on driving habits. Hopefully the dealer based his suggestion on this rather than just a standard timeframe.


Best indicator of OCI is used oil analysis. Did NAPA dealers mention that?


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles