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Consequently, once the oil is hot, a 0W-40 oil flows and lubricates the same as a straight 40 weight oil. The second number is the viscosity when the oil reaches operating temperature. The lower the number, the thinner the oil and the easier it flows. The first number is the viscosity when the engine is cold. The numbers on a multi-viscosity rating tell a different story. One of the most common misconceptions with thinner multi-viscosity oils is that might be too thin to provide adequate lubrication in a high performance engine at high temperature. What’s more, they can reduce the load on the oil pump which also frees up more power.
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Thinner oils require tighter bearing clearances to maintain oil pressure, but they also reduce friction to free up more horsepower. Others say they can gain additional horsepower running tighter bearing clearances, less oil pressure and using a lower viscosity racing oil such as a 0W-20, 0W-30 or 5W-20. But for racing applications, the viscosity you choose can vary depending on engine bearing clearances, ambient temperatures, engine RPMs and customer preferences. For older pushrod engines, 10W-30 is still the most popular viscosity. Thinner oils also flow more quickly following a cold-start to speed lubrication to the bearings, cam and upper valvetrain. Thinner oils make cold starting easier and improve fuel economy. Most late-model passenger car and light truck engines are factory-filled with 5W-20 or 5W-30 multi-viscosity oil, with some European makes specifying 0W-40 or even 0W-20 for Japanese hybrids like the Toyota Prius. They know their individual additive packages and formulations and can help you choose a product that is right for the application. The best advice here is to follow the application recommendations of the oil supplier. Some racing oils are formulated for engines that are running alcohol, or for blown, turbocharged or nitrous applications.
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Translated, this means although a synthetic oil is often thinner than a conventional mineral oil, it clings better to bearing surfaces under load.įor more demanding racing applications, specially formulated racing oils with the highest quality synthetic base stocks may be required to provide the utmost protection and lubrication.
![big truck with rocket motor drag racing big truck with rocket motor drag racing](https://cdn.drivingline.com/media/2338886/duramax-diesel-single-turbo.jpg)
This allows a synthetic oil to provide a higher film strength. One oil supplier says the molecules in synthetic oils are more consistent in size. Synthetic oils generally pour more easily at lower temperatures, resist oxidation better at higher temperatures, stay cleaner longer (extended drain intervals) and superior lubrication and wear protection. Most synthetic oils do have inherent advantages over conventional oils because synthetic oils undergo additional refining, distillation and purification that results in a very high quality and consistent base stock. The general consensus is that synthetic oil is better than conventional mineral oil. But it’s helpful to understand what some of these terms mean and how marketing people tend to misuse them in promoting various high performance lubricants. This is a lot of chemistry you really don’t need to know to choose a racing oil.