Which octane rating does the manual recommend for this engine?

How to say “Which octane rating does the manual recommend for this engine?” in Japanese

In Japanese

説明書(せつめいしょ)だと、このエンジンに推奨(すいしょう)されてるオクタン価(か)はいくつ？

Setsumeisho da to, kono enjin ni suishō sareteru okutanka wa ikutsu?

Which octane rating does the manual recommend for this engine? in other languages