I’ve never purchased a car on credit, but understand that some garages may offer you loan terms on a ‘Flat rate’ rather than quoting an ‘APR’ for the loan.
Just so you know, on a flat rate loan, you are deemed to owe the full amount throughout the loan period for the purposes of calculating the interest – rather than giving you credit for the amount paid off during the loan period.
So if tempted to take out a flat rate loan, always ask for the effective APR you will be paying.