Why do car manufacturers recommend 0W-20 oil in the United States, but the exact same engines use 5W-30 in Europe, Asia, Australia, and the Middle East? In this video, we break down the real reasons behind this confusing difference — and why most drivers have never been told the truth. You’ll learn the science behind motor oil viscosity and how different climates, emissions rules, and fuel economy regulations affect oil recommendations. U.S. vehicles are optimized for government efficiency standards, while cars abroad are tuned for durability, heat resistance, and long-term reliability. We’ll also uncover how manufacturer oil recommendations are influenced by CAFE fuel-economy laws, EPA emissions targets, and cold-weather testing. On the other hand, countries outside the U.S. prioritize thicker oils like 5W-30 to protect engines from high temperatures, heavy loads, and long-distance driving. You’ll get clear engine care tips to help you choose the right oil based on your climate, driving habits, and engine type — not just what’s printed in the manual. This includes understanding shear stability, heat resistance, and long-term wear protection. For DIY drivers, we’ll reveal practical car maintenance advice to maximize engine life, reduce oil burn, and avoid costly repairs. Whether you drive in cold U.S. winters or hot tropical weather, using the correct oil grade matters more than most people realize. Finally, we’ll share proven car repair prevention methods trusted by mechanics worldwide to keep engines running stronger for longer. If you’ve ever wondered why one engine needs two different oils depending on the country, this video explains everything clearly and simply — with real testing and real data. #CarMaintenance #EngineCare #OilChangeTips