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Car had been chirping since first month. I was using Shell gas for the first couple months and then mixed in Chevron to see if it helped the chirping, but to no avail. I finally decided to go only with Chevron for the past month and I've noticed the chirping has significantly reduced (to be honest I can't remember the last time I heard it). Hopefully this can continue. I also noticed I get better mileage using chevron compared to shell.
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