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JASO specification revisions released


The latest revision of the JASO T 903 specification, of which the first allowable use will be October 1 2016, will help to ensure future motorcycle lubricant formulations continue to deliver sufficient protection to four-stroke machines.


Here, Ishibe Nobuyuki, Technologist at Infineum Japan, examines the main changes and key drivers for the 2016 revisions, and explains why Infineum believes the inclusion of a well-defined test to guard against gear pitting is increasingly important.


With Japan’s position as a major motorcycle manufacturing country, the Society of Automotive Engineers of Japan (JSAE) has led to the development of four-stroke (4T) motorcycle oil (MCO) standards. Introduced in 1998, the first 4T gasoline engine oil standard was driven by the widening gap between the lubrication requirements of motorcycles and passenger cars.


As industry lubricant specifications for cars introduced fuel economy requirements, they tended towards lower viscosity and lower friction. This trend raised concerns that the use of thinner, often friction modifier containing oils could cause clutch slippage and transmission gear pitting wear in motorcycles with wet clutch systems.


In response, JSAE established the JASO T 903 standard, which sets quality limits as a basic measure to ensure oils deliver adequate protection to today’s motorcycles. The specification has three major requirements: physical properties, engine oil performance and clutch friction characteristics.


The clutch friction requirements categorise oils as high friction JASO MA/ MA1/MA2 or low friction JASO MB, and are central to the standard. JASO T 903 was revised in 2002, 2006 and 2011 to ensure JASO certified lubricants continue to deliver the required level of motorcycle hardware protection.


2016 update drivers Following the 2011 revisions, reports from several oil suppliers suggested that some low friction MB oils containing friction modifiers were categorised as JASO MA/MA1. The Japan Automobile Manufacturers Association (JAMA) MCO Working Group confirmed these views, raising the concern that market quality issues due to clutch slip may arise.


Another driver was the desire to reduce the amount of friction modifier required to meet MB, to help address concerns that solubility issues could lead to sediment formation, which might cause issues for scooter applications.


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LUBE MAGAZINE NO.135 OCTOBER 2016


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