148,537 - Flush radiator and re-fill coolant.

Drained and flushed radiator 4x and then refilled with about 2.5 gallons of a 50/50 mixture of
Peak antifreeze and distilled water.

This link has info regarding antifreeze/coolant recycling

http://www.sandiego.gov/environmental-services/recycling/autoproducts.shtml