I have the answer to my own question A technical representative (chemist?) from Prestone just called me back and we had a nice chat about their Extended Life Antifreeze. She apologized for the confising label on the jug. More importantly, she assured me that it is safe to leave the new orange colored antifreeze in my DeLorean for five years! It will protect the aluminum much longer than the old green antifreeze. They have some information on the Internet, including instructions on switching from the green stuff to the orange stuff: http://www.prestone.com/cooling/index.html The page says, in part: "Prestone® Extended Life 5/150 antifreeze/coolant provides today's drivers with outstanding freeze-up and boilover protection for up to five years or 150,000 miles." ". . . is a silicate- and phosphate-free formula, which provides extended performance and protection against rust and corrosion to all cooling system metals, including the lightweight aluminum found in many newer radiators." "If you decide to replace your existing antifreeze/coolant with Prestone Extended Life 5/150 antifreeze/coolant, make sure you completely drain and flush the cooling system first in order to gain the full benefits of the longer-lasting formula." My DeLorean is due for a coolant change this week. I plan to do a complete flush and put in the long-lasting orange stuff, and leave it there until 2004. - Mike Substelny ------------------------------------------------------------------------ eGroup home: http://www.eGroups.com/group/dmcnews http://www.eGroups.com - Simplifying group communications