Viral Double-Change Oil Method Sparks Automotive Debate

A viral TikTok shows a mechanic describing a Japanese-style oil change that begins with an extra quart of warm oil, followed by two separate drain-and-fill cycles and two filters, with a mid-drive interval. While proponents say it can help clean sludge on high-mileage engines, manufacturers and experts note there’s little evidence it’s standard Japanese practice and warn against overfilling, making the method controversial and not officially endorsed by automakers.