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These standards, especially JASO-MA (for motorcycles) and JASO-FC, are designed to address oil-requirement issues not addressed by the API service categories. One element of the JASO-MA standard is a friction test designed to determine suitability for wet clutch usage.
JASO M345 is a quality classification standard for two stroke engine oils for engines of Japanese origin. It was introduced by the Japanese Automotive Standards Organization (JASO) in 1994 as JASO M345-93 with the quality levels JASO FA, JASO FB and JASO FC – with FC setting the highest standard.
Both Rotella T4 15W-40 conventional and, Rotella T6 5W-40 and 15w-40 Synthetic both list the JASO MA/MA 2 standard; this information can be found on the bottle adjacent to the SAE/API rating stamp. JASO is an acronym that stands for Japanese Automotive Standards Organization. Note that the 10W-30 conventional oil does not list JASO-MA.
JASO establishes standards for various types of engine oil, including the highest grade for two-stroke engines, which is JASO FD, and JASO MA for four-stroke engines, such as those found in motorcycles. JASO is a part of the Society of Automotive Engineers of Japan (財団法人自動車技術会, Zaidan-hōjin Jidōsha Gijutsukai, JSAE).
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 ...
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API – American Petroleum Institute: organization which sets unit standards in the oil and gas industry °API – degrees API (gravity of oil) APPRE – appraisal report; APS – active pipe support; APWD – annular pressure while drilling (tool) [5] ARACL – array acoustic log; ARESV – analysis of reservoir; ARI – azimuthal resistivity ...
Crude oil is classified as light, medium, or heavy according to its measured API gravity. Light crude oil has an API gravity higher than 31.1° (i.e., less than 870 kg/m 3) Medium oil has an API gravity between 22.3 and 31.1° (i.e., 870 to 920 kg/m 3) Heavy crude oil has an API gravity below 22.3° (i.e., 920 to 1000 kg/m 3)