The trend for engine oils continuously move to lower viscosity oils for many years. The use of 20W/50 and 10W40 oils used to be the default, but become these days both 5W/30 and 5W/20 usual. Now we see the use of oils 0W/20 becoming widespread, especially in highly economcal hybrid cars and trucks.
But what exactly do these numbers mean? When reading the information on a bottle of motor oil, the upper number indicates the viscosity oils. This is a measure of how the oil flows at a certain temperature in the unit of centistokes (cSt) measured. The bottom row with the 'W' is the winter or cold rating and find out how the oil flows at low temperatures. The smaller the number before the "W, the better the oil will flow when it is cold and the lower its pour point generally.
With the advent of EPA CAFE (Corporate Average Fuel Economy) requirements automaker sought for any way possible to increase fuel consumption. Since lower viscosity oils are inherently less resistance and resistance to flow heavier oils have the trend to lighter had been more efficient motor oils. Lighter engine oils can significantly reduce fuel consumption, often 2 to 3 miles per gallon compared to the old 40wt. and 50 wt. Oils once common and that is why we have seen the move to 20 wt. Oils. Unfortunately, along with these early 20wt. Oils came, reduced wear.
One of the biggest problems associated with the lighter oils far more volatile. Many, if not most early 5W/20 and 0W/20 oil motor oils were so volatile (ie the lighter parts of the oil would boil when the oil was hot leave the heavier parts and causing the engine oil to thicken), within which a to two thousand miles of oil had thickened in the 30wt. Viscosity range. This reduced or no advantage in efficiency, by going to start on the lighter oil had eliminated won. Film thickness of lighter viscosity oil was not as good and thus wear protection was often very poor compared to higher viscosity motor oils.
With the advent of hybrid cars a few years ago 20 wt. Oil really started to come into its own. Today, we see far more use of synthetic and synthetic blend 20 weight motor oils, all of which found their protection even in heavy viscosity motor oils fully synthetic engine oil has to offer many times the film strength of oil at a given viscosity. And synthetic oils are not as likely to "cook" with its uniform molecular structure far less volatile and far and change viscosity in the high temperatures of the modern pollution-controlled motor. Fully synthetic engine oil also flows much easier and create much less friction and drag inside the engine and drive train to do than oil and thus are well suited to use in modern highly fuel-efficient hybrid cars.
In 2008 Amsoil Inc. introduced ASM 0W/20, an industry-leading, high-tech, fully synthetic engine oil chemistry combined from advanced polyalphaolifin and synthetic ester-based materials with state of the art anti-wear additive. This cutting motor oil offers incredible wear and maximizes the inherent fuel efficiency of modern hybrid car.
As environmental consciousness and saving fuel is the heart of the hybrid car ownership for many people, they buy Amsoil ASM is also being developed for a year or up to 25,000 miles oil change intervals. This vastly reduces the engine oil, the vehicle consumes and the amount of oil that needs to be recycled. Based on fewer oil changes through the course of the year also purchase adds an element of convenience and savings to the ownership of these modern economical miracle. Amsoil Inc. introduced the first fully synthetic motor oil American Petroleum Institute service requirements to meet in 1972. Today Amsoil is considered the world leader in synthetic lubrication.
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