engine oil for honda civic 1991

hello everyone,

i would like to know what kind of engine oil do i need for my honda civic 1991 ex ?

10/40 ?

20/50 ?

other ?

thank you!

Castrol GTX 10w40 works fine.

Castrol GTX 10w40 works fine.

thats the problem... most of the people say "put in 10/40" but :

the original manual book, which i have in my car, sais to put in 20/50 SG ....

who is right ?

well if he's been putting in 10/40 for the last 50,000 miles, then I don't think there would be a problem. I put 10/40 in mine for the last 2 years. And I beat the hell out of it and still no problem.

I use Valvoline Max Life 10W30, because my car has 185k miles on it. Works pretty good.