[bartje01]

I think you mean that it respawns after a little while?
Then I think you are using this:
AddStaticVehicle(487,2013.5579,-2446.8843,13.3786,86.7601,5,5);

Well. There is no timer on it.
I use this

AddStaticVehicleEx(487,2013.5579,-2446.8843,13.3786,86.7601,5,5,1300);

Look at the 1300 on the end. that is 15 minutes. Means that the car respawns after 15 minutes.
If you want to have it stay for a reaaaaaaaal long tmie use this:
AddStaticVehicleEx(487,2013.5579,-2446.8843,13.3786,86.7601,5,5,9999999);
or something xD

Also look at the Ex. at AddStaticVehicleEx. It is the same as AddStaticVehicle

Only the Ex and the last numbers are different