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    lianaks's Avatar
    lianaks Posts: 4, Reputation: 1
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    #1

    Jan 17, 2009, 07:38 PM
    Can I use lower octane gas than the it recommended in the manual?
    HI,
    I just brought a brand new Lexus, in the manual it call for 91 octane gas. At gas station the premium is 93 and the mid grade is 89, can I fill the gas with 89 octane? Will it damage the car engine if I fill the octane lower than it recommend?

    Liana.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jan 17, 2009, 07:48 PM

    Over time, it's not a good idea. A compromise is to alternate filling the tank with premium and mid-grade. Start with premium and refill it next time, at the half-mark, with mid-grade. Alternate back-and-forth. (93+89)/2 = 91.
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