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Eh, you're forgetting about the quart of dirty black oil trapped in the oil cooler & lines. 30 miles of light driving will keep the oil clean. Now go out and romp on it, drive it hard, and get the oil cooler t-stat to open & mix in that last quart of oil oil. Your clear oil will turn black instantly. The amount of soot needed to make all the oil appear black is amazinly small, a few tenths of a percent I believe.
Regards,
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