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Given the past and recent discussion regarding Mobil 0w30 vs 5w30, I'd like to exclude it from this question. In my specific application, I'm referring to oils where the 0w starts lower on the VI curve than the 5w equivalent, but is similar at operating temperature (Red Line, for example). I...

I tossed a bottle of Techron into 12 gallons of gas just as I was leaving town to see the folks. The car ran fine (idle, throttle response), but had a noticeable loss in power, and my mileage took a major dump (12-15%). I filled the tank back up when I got to my destination, and things seemed to...