The interest rate for second-hand car loans in Guangzhou is 6.6.

The loan interest rate refers to the ratio of the interest amount to the principal amount during the loan period. China's interest rates are uniformly managed by the People's Bank of China, and the interest rates determined by it are implemented after approval by the State Council. The level of loan interest rates directly determines the distribution ratio of profits between borrowing companies and banks, thus affecting the economic interests of both borrowers and lenders.