Every 5,000 miles or 6 months which ever comes first
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When it is loose, cracked or glazed, or at the interval specified in your service guide.
3000 miles
Every 105,000 miles. Water pump should also be done the same time.
Honda's maintenance schedule says 110,000/7 years. This is probably for 2001-2005 Civics, since they are the same generation, but I am not positive about that. I have seen what seems like random guesses for other Honda vehicles on this site. Go with the actual Honda recommendation!
The information is in the owners Manual.
Yrs
Yes, it is required.