Скачать или смотреть Why U.S. Engines Run Thinner Oil Than Japan: The REAL Reason Manufacturers Won’t Tell You

Why do Japanese-built engines often run on completely different oil grades compared to the exact same engines sold in the United States? The answer isn’t as simple as climate, terrain, or driving style — it’s a much deeper story shaped by government regulations, engineering priorities, and how long each market expects an engine to last. In this video, we break down the real reasons behind this contradiction, and the truth might change the way you think about motor oil forever.

We’ll explain how oil viscosity recommendations are influenced by engineering philosophy, emissions laws, and fuel-economy testing procedures. In Japan, manufacturers commonly recommend slightly thicker oil grades like 5W-30, 0W-30, or even 5W-40 because these provide stronger film strength, better wear protection, and improved long-term durability. But in the U.S., the same engines are often labeled for 0W-20 or even 0W-16, not because the engines were redesigned, but because thin oils help automakers meet strict CAFE fuel-economy requirements. These regulations push companies to prioritize efficiency numbers rather than maximum engine lifespan.

You’ll also discover how Japan’s automotive culture places heavy emphasis on longevity and mechanical stability. Their service guidelines are built around minimizing engine stress, preventing long-term wear, and ensuring reliability for hundreds of thousands of miles. Meanwhile, U.S. oil requirements are shaped by emissions goals, efficiency scoring methods, and government-mandated testing cycles that reward thinner oils — even when they aren’t ideal for high heat, long trips, or aging engines.

This video also gives you practical, mechanic-approved advice on how to choose the right oil grade based on your region’s climate, your daily driving pattern, your engine design, and the kind of long-term reliability you want. Whether you drive a Japanese domestic model, an American-market version, a turbocharged vehicle, or a high-mileage commuter, understanding these differences can help you reduce engine wear, lower oil consumption, and prevent expensive repairs.

We’ll also share proven maintenance tips used by professional technicians worldwide — from preventing timing chain stretch, to reducing blow-by, to selecting the right viscosity for hot weather, towing, or city stop-and-go driving. These are straightforward strategies that can dramatically extend engine life regardless of which country your vehicle was sold in.

Watch until the end to see why a single engine design can have two completely different oil recommendations depending on the market — and what that means for the long-term health, performance, and durability of your car.

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