Brian pays

$600 every six months for his car insurance. He just paid his bill for this year, but wants to budget for his next payment and save an equal amount each month. He has
5 months until his insurance is due again.
How much money will Brian need to save each month?

Brian pays $600 every six months for his car insurance. That means he pays $600/6 = $<<600/6=100>>100 per month.

Brian wants to save an equal amount each month for his next payment, and he has 5 months until his insurance is due again.
Therefore, Brian needs to save $100/month x 5 months = $<<100*5=500>>500. Answer: \boxed{500}.