本文最後由 娜希亞 於 2017-8-16 01:51 編輯
New JASO oil standards (MA1, MA2):
JASO effectively added the JASO-MA2 & JASO-MA1 specifications by splitting the existing JASO-MA spec into two groups by friction-performance (MA1 is the lower friction oils; MA2 the higher friction oils suitable for bikes).
The change came out as final/approved in 2006 in response to catalytic converters becoming widespread in bikes (EPA/EU requirements); it was also prompted in part by the car-lobby of the JASO organization wanting to specify a subset of the JASO-MA oils for use in their cars (the low friction oils, which become JASO-MA1). JASO-MA2 is just starting to show up in the US Market as a rating because this is the first year that catalytic converter-equipped bikes are widespread.
Aside from splitting the MA spec into two sub-groups, the new specs add a phosphorous content ceiling (better protect catalytic converters by using less, but phosphorous is also anti-wear additive, so it could be less start-up protection). JASO-MA2 being the heavier friction oils most suitable for motorcycle use will become the common standard for Japanese-built (and many Euro-built) motorcycles for the '08 and later model years.
Note that JASO-MA2 can now be API SJ formulated, but API SL & API SM formulations still directly contradict JASO-MA/MA1/MA2 standards because of the use of friction modifiers that are not wet-clutch compatible.
The JASO-MA (no suffix number) still remains in effect as well. For the Kats, API SF/SG + JASO-MA rated oils will remain the oils of choice until they are no longer available.
JASO MA:
檢測其機油潤滑的添加劑
是否會造成換(打)擋打滑 還有是否含有保護離合器的添加劑
而MA MA1 MA2
之間所謂的差別也不是外面說的跟速克達潤滑有關
MA的等級:
是在於表示機油的防止滑性差異
但不是添加啥止滑劑
更白話點就是:
引擎潤滑油中常規添加劑
會導致濕式離合器換(打)擋打滑
只好把添加劑比例或用量減少
或換其他種添加劑替補
而其等級標準分別是
(止滑效果最多) JASO MA2 > MA1 > MA (止滑效果最少)
所以今天在機油的選購:
乾式離合器:速克達 / 大羊
可以選用任何JASO MA MA1 MA2的油品
原廠推薦的引擎潤滑油
濕式離合器:檔車/大羊
一定要選擇JASO MA2的油品會比較理想
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