Advertisement. It’s logical to assume that a low viscosity oil is thinner than a high viscosity oil. https://EzineArticles.com/expert/Larry_Crider/890787, Automotive A bearing’s load carrying capacity is directly affected by clearance. This will also have a direct affect on the running clearances. This assumes we will have 0.001-inch on the top and bottom of the journal, which is true but only in a theoretical sense. When the lubricant film fails, wear occurs. Tips to Help You Choose the Right AMBULANCE, 5 Things You Should Know Before Buying A Garbage Truck, 4 Creative Approaches to Collect Funds for Your Ambulance Purchase, How to Find the Best Used Car in Your Area, https://EzineArticles.com/expert/Larry_Crider/890787, http://ezinearticles.com/?Understanding-Multi-Viscosity-Motor-Oils&id=6065625. While bearings need a solid oil film to protect against wear, there are multiple factors that come into play in order to create the ideal combination of load carrying capacity and oil flow while minimizing oil temperature. © Copyright National Automotive Parts Association. This leads directly to the value of film thickness, which is created by a combination of the oil viscosity, bearing speed, and load. Copyright © K1 TECHNOLOGIES All Rights Reserved. All multi viscosity oils will have two sets of numbers. First of all, thicker oils are much more difficult to circulate throughout the engine, which makes your vehicle much less fuel-efficient. A higher oil viscosity number indicates a thicker oil. In this article: Mobil 1, oil, viscosity. Maintenance Tools That Make Working on Your Car Easier, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Dead Car Battery? Common sense dictates that bearing clearance directly affects oil flow with predicable results. We will never sell or rent your email address. I will note again that all three of these 30-wt oils would be in the same kinematic viscosity range measured at 100C (30-wt-viscosity range) it is only the "W", winter rating that would be different. ENGINE TECH, With a static bearing clearance of 0.002-inch that means the upper half of the rod bearing has 0.0198-inch worth of clearance. To contact Larry or to get a free Amsoil products catalog by mail go to http://www.synlubepros.com, Article Source: This is where the “30” in 5W-30 synthetic oil comes from. The visual evaluation of the bearings along with a used oil analysis (UOA) revealed radically reduced physical contact between the crankshaft and the main and rod bearings with the synthetic oil. Sometimes, viscosity is also referred to as an oil’s “weight,” with a heavier oil featuring a higher viscosity grade. The fact is that very few consumers understand today's multi-viscosity motor oil ratings or the nature of how these modern motor oil work as relates to the oils viscosity. When you see an oil that’s rated SAE 30, this translates into an engine oil that has a viscosity between 9.3 cSt and 12.5 cSt at 212 degrees F. Sometimes it gets much colder than room temperature — particularly during the winter months when the thermometer can plunge well below freezing. Typically, the viscosity is reported at one of two temperatures, either 40°C (100°F) or 100°C (212°F). Petroleum oil will thin out far more at high temperatures than synthetic oil will. It should be noted that when talking about fully synthetic motor oils the same tests apply but that the performance capabilities of the oil in both hot and cold temperature extremes moves out in each direction of the scale. It is based on comparing the kinematic viscosity of the test oil at 40°C, with the kinematic viscosity of two reference oils - one of which has a VI of 0, the other with a VI of 100 (Figure 3) - each having the same viscosity at 100ºC as the test oil. This measurement is related to how an oil flows when it is cold, such as at engine start-up.
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