What happens if you use lower viscosity oil?
1 What happens if you use lower viscosity oil?.Using a viscosity one degree higher or lower than what is recommended for your engine is unlikely to cause permanent damage.īut to allay any concerns about engine protection and your vehicle warranty, it’s best to use the viscosity recommended in your owner’s manual. Low pressure can also prevent lifters from staying in contact with cams, causing noise and increased wear. Oil that is too thin can also lead to insufficient oil pressure for your vehicle’s variable valve timing system to work properly, if equipped. Because oil thins when heated, the already too thin oil becomes even thinner under extreme heat, exacerbating the problem. “Oil that is too thin cannot develop a consistent lubricating film, inviting metal-to-metal contact that causes wear.”Įxtreme stress and heat add to the challenge. Just as using an oil with too high a viscosity can lead to problems in Ruud’s engine, using an oil with too low a viscosity can have the same result. What if John went off the deep end and used 0W-16 in his 1998 Corolla instead of the recommended viscosity? Find the right viscosity oil for your engine Some automakers even allow you to switch to a lower viscosity oil depending on the weather. In this case, 5W-30 will flow more easily at startup than 10W-30. The lower the “W” viscosity of the oil, the easier it will flow when cold. It is helpful to think that the “W” stands for “winter”. However, using 10W-30 instead of 5W-30 can make cold starts more difficult. It describes the oil’s resistance to flow at 100☌, or normal operating temperature. He knows this because the second number in the viscosity rating of each oil (i.e. In addition, both oils have the same viscosity once the engine has reached operating temperature. His older bike was not built to the same tight tolerances as Ruud’s. In John’s case, using 10W-30 instead of 5W-30 reduces potential problems. Some oil viscosity differences are less pronounced Because thicker oil does not transfer heat as well as thinner oil, operating temperatures will rise, potentially leading to accelerated chemical degradation and harmful sludge and deposits. Not only that, but the engine also wastes energy pumping the thicker oil, reducing fuel consumption. The lower viscosity allows it to flow faster and fill the small gaps between parts, resulting in a durable, consistent lubrication film. His engine was specially designed to use a lower viscosity oil, in this case 0W-20. The oil does not form a consistent lubricating film, allowing metal-to-metal contact and wear. In Ruud’s case, his 15W-50 race oil may be too thick to flow fast enough to fill the spaces between the crank journals and main bearings while the engine is running. Thick engine oil may not flow fast enough With fuel economy standards tightening, automakers are leaning towards low viscosity lubricants to help them meet the requirements.įind the right viscosity oil for your engine
Lower viscosity oils reduce internal friction because they flow more easily than higher viscosity oils, improving fuel economy. This is done on purpose to allow modern engines to use lower viscosity engine oils such as 0W-20 and even 0W-16. For example, the clearances between the crank journals and the main bearings are tighter. Today’s advanced engines are built to much closer tolerances than their predecessors. Buy oil products at Solution OilĮngines are built to use a certain viscosity of engine oil. But he has some 10W-30 in his garage, so he uses it to change the oil. He is a lover of cost savings, so he buys a 1998 Toyota Corolla. Wanting the best possible protection for his new ride, he drains the factory 0W-20 and installs 15W-50 race oil. He hangs around enough gearboxes to have heard the old axiom that “higher viscosity oil equals better wear protection.” Ruud buys a new car that requires 0W-20 motor oil. Let’s look at two engine oil examples to illustrate. While it’s best to use what’s recommended in your owner’s manual, using a viscosity one degree higher or lower than recommended generally won’t cause long-term damage. A common question is whether it is safe to use, for example, 10W-30 oil instead of 5W-30 oil. People often wonder if it is safe to use a thicker motor oil or a thinner oil than what their motor manufacturer recommends.
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