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I have an 03 sentra SER 2.5l
I'm wondering what octane rating to use in this engine. I've been using 89.
I hear either a ping or injector tick almost all the time when engine cold or hot. Should I be using 93 octane or at least try it to see if the noise goes away? I don't have a user manual.
I've heard a lot of different opinions.
 
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