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I have an 09 6 4 cyl with 23K miles and it seems that the engine or lifters are getting louder. Has anyone noticed this problem? I haven't tried changing the fuel octane level yet. I really don't want to have to put premium in it.
 

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If I had to guess, you are hearing injectors. But at any rate, no octane change will get rid of a "lifter noise".
 
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