What kind of warranty did you get with the car? I the USA, we get 10 year, 100k miles. If yours is only good for six years, that's not even as good as the "free" warranty here.
The general rule on insurance is to only buy it if you can't afford the loss. If my house burns down, I'm in trouble, so I insure it. If my furnace craps out, I can afford a new one, so I don't insure it. A car is somewhere in the middle, but you still have to ask yourself what's the worst you are likely to be on the hook for, and can you afford that or not.
If you were "pressured" into buying it, I'm guessing it does more good for the salesman that it does for you.
The general rule on insurance is to only buy it if you can't afford the loss. If my house burns down, I'm in trouble, so I insure it. If my furnace craps out, I can afford a new one, so I don't insure it. A car is somewhere in the middle, but you still have to ask yourself what's the worst you are likely to be on the hook for, and can you afford that or not.
If you were "pressured" into buying it, I'm guessing it does more good for the salesman that it does for you.