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2005 chevy trailblazer_lt_ext
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2006 gmc trailblazer_ls
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I have an 06 denali envoy with 5.3 and dod still functioning with 154,500 miles. I use whatever cheaper syn blend is on sale and acdelco filter and between 5k mile oil change interval i only use less then half a quart between. Sometimes slightly more if on highway trips more. But very interesting your discovery ive learned with the dod system what makes it fail is in frequent oil changes. Thats y I change mine between 3-5k miles usually. Ive thought about tuning dod out but until i have major issues i dont think i will


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