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95 Ls400 Unleaded Fuel (Question)


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Hi i recently bought a 95 ls400 and ive noticed some knocking in the engine, and i did some research on this thread, i believe it to be because i have been using 87 octane fuel. If i switch to 91 octane will the knocking stop? and am i able to mix 87 and 91 together in the same tank? Right now im at half a tank of 87, should i just wait till i run out then put in 91? Thanks

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