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Why does it seem like every other year original equipment manufacturers or API/ACEA come out with new oil-performance standards?

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Why does it seem like every other year original equipment manufacturers or API/ACEA come out with new oil-performance standards?

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Changing oil performance standards are directly related to continuously evolving emissions regulations. In an effort to obtain cleaner air, the trucking industry must abide by these governmental regulations. So they are constantly making design changes to their equipment, generally resulting in a harsher environment for the oil: higher temperatures, higher soot loads, or even the need to be compatible with after-treatment systems. Bottom line? Low emission engines need higher performing products. Therefore, when emissions regulations change, so do oil specifications. Even if you have an older engine that does not meet the latest emissions standards, it still benefits from oils that are formulated to the latest standards. Improved oil performance means improved engine protection for long engine life. And since oils meeting the newest specifications have better soot control and deposit protection, your engine will also get excellent protection against lost power, lost fuel economy, and i

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