Just a thought. My envoy has 35000 miles and i have only changed my oil 4 times (using synthetic motor oil). I am waiting for the change engine oil light on the gauges. According to the manual, the computer detects when the engine oil needs changing and it could sometime run up to 10000 between oil change. I am quite concerned since most shops would do it every 3500 miles or 3 months. Which should i follow, the manual or the experienced shop mechanics? :roll:
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