Put two realistic offers on the same car through the same arithmetic and the difference between a good deal and an expensive one stops being a matter of opinion.
Take a R300 000 car financed at 13,25% a year with no deposit. Over 60 months the instalment works out at about R6 864 and you repay roughly R411 800 in total, of which about R111 800 is interest. Stretch the same loan to 72 months and the instalment drops to about R6 060, a saving of more than R800 a month, but the total climbs to roughly R436 400 and the interest bill to about R136 400. That extra year of breathing room costs around R24 600.
Now add a 25% balloon to the 72-month deal. R75 000 of the price is pushed to the end, the instalment falls to about R5 375 and the offer looks like the cheapest on the table. It is not. You pay roughly R386 900 in instalments and still owe R75 000, so the car costs about R461 900 in total, some R25 500 more than the same deal without a balloon.
A deposit pulls hard in the other direction. Put down R30 000 on the same car and you finance R270 000, the 72-month instalment falls to about R5 455 and the interest bill drops by roughly R13 600, before you count the sharper rate a deposit often unlocks.
None of these figures include the initiation fee, the monthly service fee or the comprehensive cover a financed car has to carry for the full term. Add those and the ranking can shift again, which is exactly why the written quotation matters more than any headline rate.