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I have an 04 Silverado 5.3 ltr. My engine makes lots of noise at 7,000 miles. I took it in and complained of 'Spark knock.' They said all the specs are correct and that I should use premium fuel. I switched to premium and it reduces the clatter quite a bit, but I am not happy to pay extra for fuel to solve their problem. My owners manual says 87octane is all that is required. I should'nt have to pay for premium.
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