I've changed oil in my cars myself for decades. We recently purchased a Chevy Cruze LT, and with GM's requirement for "Dexos approved oil" for their warranty, that put a surprising kink in things. It turns out that not many oils are Dexos approved. But this one is, plus it gives you confidence that it will last longer than the car thinks it can in case you do run it to where your car says to change it. That all being said, I think 15,000 miles is stretching it. My oil looks pretty dark after 5,000-6,000 miles, which is the interval I tend to change it. The car says it still has 50% oil life remaining, but it's cheap insurance to me to keep the oil fresh. My other car has 375,000 miles on it (and still going) and my previous car had 275,000 on it when I sold it. Both are 4-cylinder engines. I attribute that longevity to regular oil changes using quality oil & filters as well as keeping up on other routine maintenance.
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