I watch the dipstick regulary, it's one of the ways I communicate with the car. It tells me level changes and color. Whether from heat or dirt, very dark-to-black is not a good thing in my "old system" mind.
Related question for the forum: do track miles differ from regular miles? I would think they do. The rpm's are higher, but my temp gage stays not much above 180 on the track, even on a hot summer day in the south.
Too much knowledge - my instincts tell me to change the oil more often due to occassional track use - every 7,500 feels right to me. But now I need to worry about my oil being "too fresh"???
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