[Edit] 
Gas for a Lexus
My owners manual recommends premium for optimum performance.
I alternate between premium and regular.
If you repeatedly use regular with 87 octane you might notice knocking when travelling uphill.
My owners manual recommends Plus with an octane rating of 89. For improved performance it recommends premium with an octane rating of 92 or higher.
NEVER use Regular with an octane rating of 87.
First answer by ID1088788412. Last edit by 98 B-LINE. Contributor trust: 53 [recommend contributor]. Question popularity: 25 [recommend question]
Answers.com > Wiki Answers > Categories > Cars and Vehicles > Asian Cars > Lexus > Lexus RX > What kind of gas does a 1999 Lexus RX 300 take?
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