Here are some questions for you to consider that will help you determine which choice to make...
Where is the R200k coming from? Surplus acumilated income, an investment, a policy that has matured, inheritance, severance package, etc.
How much is your current income and how much is left over after your monthly expenses?
How secure is your current income?
What portion of your current income is going into savings?
What short term and long term debt do you currently have or are considering making?
What assets do you currently have?
What financial responsibilities do you have currently and will potentially be undertaking in the next 5 years?
Lastly draw up a few spreadsheets so that you can calculate over 5years:
a) investment of R200k
b) R200k car finance monthly repayments over 5years
c) monthly investment equal to b)
d) what your current debts if any will cost over 5years
e) what your current debts if any reduced by R200k now will cost over 5years.
Don't forget to include initiation fees and monthly admin fees and costs of additional surety policies if needed.