[f30nynj]

So I was trying to trade-in my 2007 328xi with43k miles on it. Very clean and excellent condition.

One salesman at a dealer after physical inspection said it would go for $17000. He did check carfax, vehicle history and used paint meter to check all around.

Then I go to another dealer and he tried same but offered only $15500.He says its the full book value and they refer to black book.

Does anyone know what this black book is and how can I check it myself?

Thanks!