It's a combination of the things you mention, to the best of my knowledge. Many vehicles today are able to "monitor" the condition of the oil in addition to evaluate how they are being driven. Da computers are taking over.
2012 GC Overland Summit - Winter Chill with New Saddle interior. 5.7L HEMI V8 - Pirelli Scorpion Verde Plus "shoes" - LED fogs and DRLs
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