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Lending tree does not actually lend money. Lending tree operates as a referral service to banks that lend money.
You will not get 2.5% financing from a bank or credit union on a three year old car. Full stop. It won't happen. Even the best credit unions aren't offering rates that low on cars that age to prime credit profiles.
Continuing to work with lending tree seems to be a very good way to end up with a lot of pulls and no good results.
Lending tree is pretty worthless in terms of getting the best rates. It is best to go with a credit union directly, DCU and Penfed are great options and of course there are many great local credit unions. The rate will depend on the age of the car, fico scores and length of the loan. If your scores were 700 when you bought the car 3 years ago my guess is you financed through a dealer who marked up your interest a fair amount.