Buying car with own money vs. Loan
Your decision should depend on 2 factors.
What are you planning to do with the money at hand. Can you earn more than the car loan interest rate with your money? For example it may be possible if you are investing the money in good performing equity MFs for a car loan duration, say 4-5 years. You can compare car loan interest and return on your investment for the same money (factoring the risk). Check whichever is higher and take call.
If you are taking car loan from your corporate using corporate car loan, and adding the tax savings benefit of car loan as well as fuel cost, that could be more favourable to go for corporate car loan.
Unless I see these numbers like, loan interest rate, estimated tax benefit, expected return from your investment given the risk of the investment (need to understand your risk appetite), calculations are difficult.
If you are most likely to keep available money into savings bank or bank FDs, it is beneficial to use this money to buy the car, rather than going for the car loan.