Join Date: Jul 2014
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On page 599 of the Lexus manual, it states,
You must only use unleaded gasoline in your vehicle.
Select Premium unleaded gasoline with an octane rating of 91(research octane number96) or higher required for optimum engine performance. If 91 octane cannot be obtained , you may use unleaded gasoline with an octane rating as low a 87(reseach octane number 91). Use of unleaded gasoline 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.
My area has only 87, 89, and 93 available. I read in another forum where some say it is ok to "blend" your fuel. So fill the tank with 93 and when it's half empty I fill with up 89. It's a small savings but every penny counts and the NX is running fine. Anyone using regular(87) is asking for engine trouble in the long run.
On the flip side, some people leasing these might be putting in regular gas and not the level of premium that's required. Just something to keep in mind for anyone who plans on buying one used down the road. If there's any way to tell if this was done, then by all means do the testing required.
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