[mansonh]

Learn to script: http://forum.sa-mp.com/index.php?topic=2750.0
https://sampwiki.blast.hk/wiki/Main_Page
And
Script Request Thread:http://forum.sa-mp.com/index.php?topic=144062.0

b) Do not bump
Some people apparently think they are important enough to bump their own topic after 10 minutes.
You can bump topics when the last reply is at least 12 hours old.

I really shouldn't give this too you especially as its the wrong section, and you just bumped.
However, as I am feeling nice, I will give you a basic version.

new cartimervehicle;

public OnGamemodeInit()
{
SetTimer("CarTimerSpawn",900000,false);
}

forward CarTimerSpawn()
public CarTimerSpawn()
{
cartimerdrop = CreateVehicle(400, 2505.7378,-1694.3157,13.3312,0,0,0);
SetTimer("CarTimerDestroy",180000,false);
}
public CarTimerDestroy()
{
DestroyVehicle(cartimerdrop);
SetTimer("CarTimerSpawn",900000,false);
}