public OnPlayerEnterVehicle(playerid,vehicleid,ispassenger)
{
    new veh = GetPlayerVehicleID(playerid);
    new Float:x,Float:y,Float:z = GetPlayerPos(playerid,x,y,z);

    for(new i;i<MAX_PLAYERS<i++;)
    {
        if(IsPlayerInVehicle(i,veh) && GetPlayerState(i) == PLAYER_STATE_DRIVER)
        {
            if(GetPlayerTeam(i) == GetPlayerTeam(playerid))
            {
                SetPlayerPos(playerid,x,y,z+15);
                                SetPlayerHealth(playerid,0);
                SendClientMessage(playerid,COLOR_ORANGE,"Server: Do not jack team vehicles!");
            }
        }
    }
    return 1;
}

{
    if(vehicleid == Car)
    {
      SendClientMessage(playerid,COLOR_ORANGE,"Server: You have the car! Take it back to base!");
    }
    return 1;
}