[aerohead]

* I stopped at four 'oil change' locations in Denton, Texas, two oil-change businesses, and two new car dealerships:
- The two oil-change businesses reported that they had never experienced draining oil from cars or light trucks which did not possess discoloration.
- The Toyota dealership service department had the same experience.
- The Ford dealership service department said they 'have' experienced recently-purchased, new Ford cars, in for new car warranty oil & filter changes, which showed virtually no 'color' when drained.
So we must entertain the notion that, at least for new, or recently-purchased Ford automobiles, that an owner might witness no discoloration at 10,000-miles / one-year's service.
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No one recommended extending an oil change interval beyond 10,000-miles, or one-year, as the additive package is not certified by the manufacturer to function beyond this distance/ time threshold.