5W30 vs 5W40: The Diesel Oil Showdown (Real Test Results)

Описание: Many diesel owners think that simply choosing a synthetic oil guarantees full protection. But the reality behind 5W-30 vs 5W-40 diesel oil is far more nuanced. In this video, I explain what these numbers actually represent, how they impact your engine in everyday driving, and why your oil choice should be based on more than a label on a bottle.

Here’s what you’ll discover 👇
🛢️ What “5W” really means, and how viscosity changes when your engine is hot or cold
🌡️ How temperature and climate determine which oil performs better
⚙️ Why engine design matters—from modern high-pressure systems to older diesel blocks
📘 What specs like API CK-4, FA-4, and ACEA C-ratings actually tell you
🔍 Why manufacturers often push thinner oils for efficiency
🔧 And why many mechanics prefer thicker oils for long-term durability and wear protection

Whether you’re driving a diesel car, SUV, van, or truck, this breakdown clears up years of confusion and gives you the information you genuinely need before your next oil change.

✅ Bottom line: Both 5W-30 and 5W-40 can protect your diesel engine—as long as the oil meets the correct specifications and you change it at the right intervals.

⚠️ Disclaimer: This video is for educational purposes only. Always follow your vehicle manufacturer’s oil requirements and service recommendations.