主题：【求助】关于添加机油 -- 兰州人

可能尾排漏，所以气检能通过。

Find the cheapest 机油 you can find. Mix different brand of 机油 is ok. Do worry about that.Use 10W40 may be better for you considering the condition of your car. How do I know? I have done that. I used to have 10+ year old car with 100k+ miles on it.

Usually newer cars recommends 5W30 in their owner's manual, cars manufactured in 80's recommend 10W40. 90's is the time they start to change. I am not sure which one your car recommends. However 10W40 will be safer than 5W30 if you are not sure which one to use. If you use 5W30 on a car used to use 10W40, you will see the oil leak from gaskets.

我打中文字很慢，而且很多子都不X打。（X　should be huei)。