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Not sure with DCU but usually new is 2012-2014, used 2010-2012 or sometimes little less and than older model is 2010 or under depending on bank.
some banks also put in max miles to still fit in the new or newer used category.
Navy Federal Credit Union posts it on their website what calsifies for each rate.
I saw somebody refinance a 2002 Avalanche with 100k+ miles at the 1.9% rate