Veteran mechanic questions common US oil change habits

A mechanic with two decades of experience recently discovered a Japanese oil change technique that uses extra oil, two filters, and two full flushes. The approach, shared in a widely viewed TikTok by Tyler Wesley, has generated both interest and doubt about whether American methods could benefit from adjustments.

Wesley admitted he had never encountered this practice before seeing the video. Initially, he dismissed it as unnecessary. The process begins by adding a quart of fresh oil to a warm engine before draining the old oil. After a brief drive, the new oil is removed, a second filter is installed, and the engine is refilled again. According to Wesley, the goal is to remove contaminants and sludge more thoroughly.

The reason they still do it is because the cars that they’ve done this on have reached up to 600,000 miles. And we’re not talking some top-of-the-line engines here, we’re talking about crappy four-cylinder engines.

Why the Japanese method challenges standard practices

Most drivers rely on the standard oil change procedure: draining the old oil, replacing the filter, and refilling. However, the Japanese technique’s focus on multiple flushes and prolonged circulation has raised questions about potential gaps in conventional practices. While not entirely unknown in some maintenance circles, its origins remain unclear.

Some elements of the Japanese approach align with established advice. Warm oil drains more efficiently, and fresh oil contains additives that help dissolve deposits. Yet the recommendation to drain oil after just 15–20 minutes—particularly after a full refill—lacks widespread industry support. Valvoline, for example, suggests a more gradual method: draining the old oil, adding a cleaning agent, and driving normally until the next scheduled service.

Experienced mechanics caution that forcing sludge to dislodge at once can obstruct oil pickup screens or damage engine parts. The viral method’s first step, adding excess oil before draining, also raises concerns. Most automakers, including Toyota, advise against overfilling, as surplus oil can harm the engine.

The technique’s online popularity has fueled speculation about undiscovered Japanese maintenance strategies, but documented evidence of it being a standard practice is limited. Toyota’s official maintenance guides emphasize maintaining correct oil levels and replacing filters regularly. There is no reference to double oil changes or forced flushes.

Despite this, the method may hold value in specific cases, such as engines with severe sludge accumulation or those operating on older, less refined oils. For the average driver, however, the additional cost and effort may not outweigh the benefits. Wesley himself proposed testing the method purely out of curiosity, though he acknowledged the expense.

Longevity trade-offs and engine risks

The ongoing discussion reflects a broader conflict between tradition and innovation. The standard oil change has served drivers well for decades, but the Japanese method’s aggressive flushing approach could provide insights for high-mileage or heavily used engines. Whether adoption is justified remains uncertain, though most mechanics would likely continue favoring the simpler method for now.

One key observation in this debate is the method’s focus on engine longevity. The issue extends beyond whether American methods are inadequate; it questions whether refinements could improve a process that has remained largely unchanged for generations.

For now, practical testing may hold the answer. Wesley’s viral video has already encouraged some drivers to experiment, though the majority will likely revert to familiar routines. The broader lesson? Even in maintenance, established practices should not go unexamined.

Toyota’s official documentation confirms that standard oil change intervals remain the recommended approach for most vehicles. The company’s guidelines do not endorse the double-flush method, reinforcing the gap between viral trends and manufacturer-backed practices.

Industry experts suggest that while the Japanese technique may offer benefits in niche scenarios, its risks, such as potential engine damage from overfilling or forced sludge release, outweigh the advantages for typical driving conditions. The lack of widespread adoption among automakers further supports this view.

Cost, skepticism, and mixed real-world results

Wesley’s skepticism persists, though he acknowledges the method’s potential in extreme cases. His initial reaction, dismissing it as impractical, has softened slightly, but he remains unconvinced that the average driver would benefit from adopting it.

A double oil change, with two filters and additional oil, can exceed standard service prices by 50% or more. Without clear evidence of long-term benefits for most engines, the financial investment may not be justified.

Mechanics interviewed by automotive forums report mixed results when attempting the method. Some drivers claim improved performance in older vehicles, while others experience no noticeable difference. The lack of controlled studies makes it difficult to draw definitive conclusions.

As the discussion continues, one fact remains clear: the standard oil change procedure has proven reliable for millions of vehicles over decades. While the Japanese method may offer theoretical advantages, its practical application remains unproven for the majority of drivers.

The debate over oil change methods shows a larger trend in automotive maintenance. As vehicles become more sophisticated, traditional practices are being reexamined. Whether this leads to widespread adoption of alternative methods, or simply greater awareness of existing options, will depend on further testing and industry endorsement.