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All rights reserved. Choose your language. Make a selection to continue. I am an International customer UK customer. Magazine Subscribe Today! Current Issue Archive Advertise. High or Low Viscosity Index?
A lubricant may merit having a high VI for one or more of the following reasons: The optimum viscosity is not known Varying loads and speeds exist Varying ambient temperatures exist To boost energy efficiency To boost oil service life lower average temperature To boost machine service life fewer repairs and downtime Cheaper, lower VI lubricants may make sense if: Speeds and loads are constant Temperature is constant constant ambient temperature or a heat exchanger is in use The optimum viscosity at the operating temperature is known and is consistently achieved.
About the Author. Jim Fitch. Jim Fitch, a founder and CEO of Noria Corporation , has a wealth of experience in lubrication, oil analysis, and machinery failure investigations. He has advise Read More. Related Articles. Dynamic vs. Kinematic Viscosity: What's the Difference? Can an Oil's Viscosity be Reduced? Overcoming the Risks of Cold Machine Starts.
Featured Videos. Atten2 S Oil Wear 2. Featured Whitepapers. Does water ingress have to be the end of your oil's life? If you are using a mold rubber with a high viscosity, there is a chance the rubber will cure with air bubbles that may then be reflected in a finished casting.
If the mixed viscosity of the mold rubber you are using is higher than 15, cps, you may want to consider vacuum degassing the liquid mold rubber. What does viscosity mean to you when selecting a casting resin? However, this is not always the case.
First of all, thicker oils are much more difficult to circulate throughout the engine, which makes your vehicle much less fuel-efficient.
This can also make it more difficult to start your vehicle, which can increase engine wear. Just as how thinner oils become even worse in warm weather, the disadvantages of thicker oil become more important during colder months. When temperatures drop, oil becomes thicker, which can put significant strain on your battery, and may even leave you unable to start your vehicle.
Lastly, high-viscosity oil is not able to transfer heat between engine components as easily as low-viscosity oil is able to. Moreover, thicker oil can increase internal operating temperatures, which can ultimately lead to engine failure as oil passages become blocked by sludge.
As mentioned throughout this article, it is crucial that you pick the oil with the ideal viscosity for your vehicle in order to protect against engine wear.
Fortunately, determining the viscosity needed for your vehicle should be relatively easy. Often, the manual may specify multiple options to choose from depending on the weather. For example, it may recommend 5W synthetic oil for warmer weather, and 0W oil for colder weather. Amsoil products will specify the viscosity of the oil across the front of the packaging. Additionally, you should understand what the numbers identifying different viscosities mean.
The lower this number is, the easier it will be able to flow in cold weather.
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