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Yes quite interesting. Something I did not pay a lot of attention to up til now. Perhaps oversimplifying, but it would appear most any car I'll own just gets OAT. I'll know to look for that designation.

You've reminded me (overdue) time for total flush for both mine. The Cady got its last one in '09 with oem traditional green type (- I presume IAT), and I did all-new Dex-Cool in the SS in '03.
 
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