I Investigated 0W-20, 5W-30 & 5W-40 in the ENGINE — Only 1 Actually Earned It

I Investigated 0W-20, 5W-30 & 5W-40 in the ENGINE — Only 1 Actually Earned It 0W-20, 5W-30, or 5W-40 — which engine oil actually protects your engine best? In this video, we investigate the real differences between these three popular motor oil grades and break down the claims that thicker oil always means better protection. You’ll learn what the viscosity numbers actually mean, why modern engines are designed around specific oil grades, why Japanese automakers have moved toward thinner oils, and when using a thicker oil can actually make sense. We also look at 0W-20 in modern Japanese cars, 5W-30 in older and high-mileage engines, 5W-40 in European and performance engines, turbocharged engines, hot climates, hybrids, oil dilution, and whether switching to thicker oil is really an upgrade. Most importantly, we explain why the approval printed on the bottle — such as API SP, ILSAC GF-6, dexos, or manufacturer-specific approvals — can matter more than simply choosing the thickest oil on the shelf. The real answer is not “thicker is always better.” The right oil is the grade your engine was designed for, with the correct approval, changed at the right interval. If you drive a Toyota, Honda, Lexus, Mazda, Nissan, Subaru, or another Japanese car, this video could completely change how you choose engine oil. What oil do you use right now: 0W-20, 5W-30, or 5W-40? Tell us your car, year, mileage, and climate in the comments. Subscribe for more Japanese car tips, engine maintenance, oil change advice, mechanic secrets, and practical ways to make your car last longer. #EngineOil #0W20 #5W30 #5W40 #CarMaintenance #JapaneseCars #MechanicTips