In front, below the radiator, behind the rectifier. You have to remove the rectifier cover, rectifier, and rectifier bracket. Then you have access to the filter. At least that is how it is for later model 900's.
+1 on that. Now I only use K&N KN-303 filter. Super easy to remove.
For US volumes for oil: 3.2 quarts when filter not removed, 3.4 quarts hen filter replaced, 3.9 quarts when engine is completely dry.
Keep the bike upright when looking at the sight glass. Resist the urge to over-fill. Anywhere between the two sight lines is ok, but I try to fill mine to a little more than half-way in-between the sight lines.
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