If checking under different conditions (based on what I read)...
- Near the top line if the bike is cold
- Near the bottom line if the bike is warm
- Near the top line if the bike is on the center stand
But ditto to what Got2Go said ... the difference between bottom and top lines is less than 1/4 of a quart, so really anywhere along the sight glass is ok. But don't go way higher! Apparently Bad Things can happen (I can't remember exactly what).
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