什麽車，多少年份，發動機油底殼？一般來說不建議用堵漏劑。”it might do harm than good…

Google: Be aware that many oil additives only provide a quick, temporary fix for small leaks. One-off emergency use will not necessarily do your engine any harm, but repeated use can do more harm than good. After a while excess additives often settle and clog up the system.