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  2. American Petroleum Institute - Wikipedia

    en.wikipedia.org/wiki/American_Petroleum_Institute

    The American Petroleum Institute (API) is the largest U.S. trade association for the oil and natural gas industry. It claims to represent nearly 600 corporations involved in production , refinement , distribution , and many other aspects of the petroleum industry .

  3. API-TC - Wikipedia

    en.wikipedia.org/wiki/API-TC

    API TC is a certification for two-stroke oils, awarded by the American Petroleum Institute. It is given after the product passes through stringent tests that determine the level of detergent performance, dispersion, and anti-oxidation. It is the only remaining, not revoked classification of the API Two-Cycle motor oil specifications (TA, TB, TC ...

  4. Air Pollution Index - Wikipedia

    en.wikipedia.org/wiki/Air_Pollution_Index

    In Hong Kong, there were two types of API: General API and Roadside API. The EPD reported the latest APIs hourly. The index and the air quality objectives were set in 1987; and pollutant levels are measured over varying periods, in μg/m 3. There are hourly, 24-hour and annual targets for sulfur dioxide and nitrogen dioxide, and 24-hour and ...

  5. Motor oil - Wikipedia

    en.wikipedia.org/wiki/Motor_oil

    The previous service categories such as API CC or CD are obsolete. API solved problems with API CI-4 by creating a separate API CI-4 PLUS category that contains some additional requirements – this marking is located in the lower portion of the API Service Symbol "Donut". API CK-4 and FA-4 have been introduced for 2017 model American engines. [24]

  6. Shell Rotella - Wikipedia

    en.wikipedia.org/wiki/Shell_Rotella

    The line includes engine oils, gear oils and coolants. The oil carries both the American Petroleum Institute (API) diesel "C" rating as well as the API gasoline engine "S" rating. Ratings differ based on the oil. Rotella oils, like the T3 15W-40, meet both the API CJ-4 and SM specifications, and may be used in both gasoline and diesel engines.

  7. SAE J300 - Wikipedia

    en.wikipedia.org/wiki/SAE_J300

    This standard is commonly used throughout the world, and standards organizations that do so include API and ILSAC, [2] and ACEA. [3] The SAE has a separate viscosity rating system for gear, axle, and manual transmission oils, SAE J306, which should not be confused with engine oil viscosity. The higher numbers of a gear oil (e.g., 75W-140) does ...

  8. Watercut meter - Wikipedia

    en.wikipedia.org/wiki/Watercut_meter

    A water cut meter measures the water content (cut) of crude oil and hydrocarbons as they flow through a pipeline. While the title "Water cut" has been traditionally used, the current API naming is Water Cut Analyser or WCA as OWD or On-Line Water Determination is trademarked.

  9. Gear oil - Wikipedia

    en.wikipedia.org/wiki/Gear_oil

    Gearbox oils are classified by the American Petroleum Institute using GL ratings. The higher an oil's GL-rating, the more pressure can be sustained without any metal-to-metal contact taking place between transmission components. Separate differentials usually have higher pressure between metal parts than gearboxes and therefore need higher GL ...

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