Back in the day, people were told to change the oil in their cars every 3,000 miles. There were no reservations, restrictions, or excuses about it. That was likely thanks to a clever marketing tactic used by oil companies and automakers to sell more oil, but it’s a rule of thumb that has stuck with generations of consumers. But during that time, things like synthetic oil and computers that ran real-time diagnostics like oil-life monitoring systems that told you exactly
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