While credit unions historically offer better interest rates, both banks and dealers have promotional deals to entice new borrowers. Some dealers may even offer loans with interest rates as low as 0% or 0.9%. So it’s definitely worth your time to shop around.
In addition, some dealers work directly with banks and credit unions to find a rate, especially if the dealer doesn’t offer in-house financing. Therefore, you should ask the dealer if they work with local credit unions or banks as this may simplify the loan process.