2015 Lexus Is350 f sport gas gap says to use only premium am i damaging the engine by using regular gas????
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Here's what Lexus says:
"Premium unleaded gasoline with an octane rating of 91 (Research Octane
Number 96) or higher required for optimum engine performance. If 91
octane cannot be obtained, you may use unleaded gasoline with an octane
rating as low as 87 (Research Octane Number 91). Use of unleaded gaso-
line with an octane rating lower than 91 may result in engine knocking and
significantly reduced performance. Persistent knocking can lead to engine
damage and should be corrected by refueling with higher octane unleaded
gasoline"
Page 571 your owner's manual, downloadable from
https://assets.sia.toyota.com/publications/en/om-s/OM53C90U/pdf/OM53C90U.pdf
So, 91 octane OK, 87 will work, but not recommended.
