You can try unioil 91 or 95 octane. But I prefer 95 octane. Dati petron, shell at seaoil ako nagpapagas lahat nag engine knock. Once i tried unioil never na nag engine knock. Pag bumabalik ako sa petron nag engine knock ulit. So ngaun unioil nako lagi. Mag 1 year nako sa unioil so far so good. Vios sakin gen 2.5.