Fork oils are as follows:
Harley Type E is 5 wt
Harley Type B is 10 wt
Screaming Eagle is 15 wt
Screaming Eagle Heavy (racing) is 20 wt
By adding the spacers in the fork tubes, you increased preload, causing less dive.
Adding thicker oil slows compression damping, however, if it gets cold in your area, 20wt can be a little too heavy and start making a "knocking" noise in the front, on fast movement, or while going over bumps. As can 15wt....
Your results will vary.
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RIP Rick Massey: AKA-Rubberdown. Godspeed, 02-02-12.