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By merihb2 | AA Member | 1 Post | 23 June 2013 at 10:45am

We have a 2005 Lexus IS350. We have been using 95 octane but would like to know if we can use 91?

By Donavan | AA Expert | 1049 Posts | 24 June 2013 at 9:07am

Going on the high compression ratio this engine has, the 91 octane fuel will not be sufficient, and you need to use the 95 Octane fuel.