What is the shear value of engine oil?

[LaCassandra]

Oil shear value refers to the oil film strength of engine oil under high shear conditions at 150 degrees Celsius. The higher the value, the greater the strength. The following are the functions and requirements of engine oil: Functions of engine oil: Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. Advanced technology can convert natural gas into crystal-clean fully synthetic base oil, to which unique power cleaning technology is added, creating lubricants with superior cleaning and protective performance. Requirements for engine oil: As a type of machinery, engines have common requirements for lubricants similar to general machinery, such as appropriate viscosity, certain anti-oxidation, anti-wear, anti-corrosion, and viscosity-temperature properties.

[Simoes]

I just bought a new car last year, and the oil shear value is quite important. Simply put, it refers to the oil's ability to maintain viscosity under the high-speed squeezing conditions of the engine. Imagine the pistons and bearings rubbing against each other—if the oil's shear value is low under high temperature and pressure, it will thin out, losing its protective layer, leading to increased engine noise and higher fuel consumption. I didn’t understand this before and used regular oil, only to find the acceleration sluggish. Later, I switched to multi-grade oil with a high shear value, like 5W-30, and it made a big difference. Now, during every maintenance check, I specifically ask the technician about this value to ensure smooth engine operation. When choosing oil, the higher the shear value, the better. Generally, you can look at the API certification level—SAE-standard oils like 10W-40 are more reliable and can extend engine life. With longer oil change intervals, oil with a good shear value reduces the risk of major repairs, saving both money and hassle.

[LawsonLynn]

As someone who frequently helps out in the garage, the oil shear value is a crucial indicator, referring to the oil's ability to resist thinning under the friction of mechanical components. For example, when the engine runs at high speeds, the pressure on the bearings increases, and oil with poor shear value can easily lose viscosity, leading to oil burning or wear. I've seen many cars suffer from cylinder scoring due to using low-shear-value oil. When choosing oil, pay attention to the SAE index on the oil container—for instance, 0W-20 oil typically has a higher shear value and offers better protection. Multi-grade oils enhance this value through additives. Regular testing, especially during summer or long-distance driving, ensures the shear value remains stable, preventing power loss and abnormal noises. In practical maintenance, I recommend checking the oil condition every 5,000 kilometers. Don't skimp on oil changes—high-shear-value oil may be more expensive, but it saves money on repairs.

[McSkylar]

As a racing enthusiast, the shear value of engine oil is absolutely crucial in performance cars! It refers to the oil's ability to maintain its original viscosity under high-speed shear forces, essentially ensuring the oil doesn't break down during intense track battles and continues to protect the engine. Everyday street cars might not care, but after I modified my car for more horsepower, low shear value—like using cheap synthetic oil—led to oil film breakdown, increased noise, and even turbo damage. High-quality oils like full synthetic 5W-30 have superior shear values, reducing heat buildup and improving acceleration. When changing oil, pay attention to the brand and specifications—API-certified multi-grade oils are ideal for temperature variations.