Change it if the new one is OEM. At $5.00 a pop it's not like your throwing too much money around... and your fresh (orange) coolant and system will have an even fresher start. Don't forget to drain the block

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14