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Why would a car company lend me money at a very low interest rate?
In addition to the other answers, also consider this: Federal bond interest rates are nowhere near the rates you mentioned for short term bonds. They are less than 1% unless you're talking about terms of 5-10 years, and the rates you mentioned are for 10 to 30-years terms. Dealer financed car loans are usually 2-5 years (the shorter the term - the lower the rate). In addition, as said by others, you pay more than just the interest if you take a car loan from the dealer directly. But your question is also valid for banks.