The thermostat is there for a reason.....lolthat time i dont have knowledge about thermostat. so, just listen to what mechanic said. so, next service, will buy 1 and get it fitted. Is it standard thermostat for wira/satria right, doesnt matter 1.3, 1.5 or 1.6? I wana ask here first before consult the car sparepart shop, at least I go buy the thermostat with some knowledge. Mine is 1.6