well, all I know is when I towed frequently with the tahoe, it was about 7000 miles between oil changes, and in the time periods where I did no towing, it was about 13000, so it does know how the car is being used. As for the oil, like the one guy said, its based on what the recommended oil is, so if you up or down grade, results may vary. I don't keep a car much past warranty anyway, so I do the minimum required (except on the Z, as it gets an oil change every other track day, or about 6 or 7 changes per year.)
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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