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#1128067 - 04/12/08 11:27 PM JASO A1 standard ?
MonumentOiler Offline


Registered: 02/04/07
Posts: 442
Loc: Monument, CO, USA
All the Multi-vehicle ATFs claim to be meeting it without much explanation of what it means. Are the Japanese manufacturers uniting behind a standard in the face of D-VI ? Are there serious tests required to meet this standard ? Is an ATF with this approval better than one without ?

 Quote:
Castrol Import Multi-Vehicle ATF exceeds the requirements of the JASO-1A performance standard created by Japanese Automobile Manufacturers. This standard is recognized by Japanese OEM's in certifying ATF for use in their vehicles. Consequently, Import Multi-Vehicle ATF has Castrol’s first ATF performance claim: “Superior Performance for Maximum Transmission Life”

From Penrite -
 Quote:
there are no API standards for automatic transmission fluids. Indeed, it is only in recent times that the Japanese have released a draft general industry standard that stands alongside
their individual requirements. (JASO M315-1998, now called JASO-1A).

Afton chemical rep talking about Mercon LV mentions it -
 Quote:
"Another key demand is for greater friction stability. We've seen this emphasized with General Motors' Dexron VI fluid, with the JASO specification in Japan, and now Ford's Mercon LV. The OEMs want consistent friction performance -- shift feel -- throughout the life of the product, and for the product to have a longer life as well."


Edited by MonumentOiler (04/12/08 11:28 PM)

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#1128386 - 04/13/08 01:37 PM Re: JASO A1 standard ? [Re: MonumentOiler]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
Yep, if you have 2 similar fluid choices and 1 has the JASO spec, then I would choose it. But, IMO, Mercon-V, ATF+4 and DexronVI are quality ATF(finally). To think our domestic ATF's have been lacking for years.

Chevron Multi-Vehicle ATF has been tested for performance in Japanese transmissions under the JASO 1A ATF standard. The product will deliver the shifting performance and superior anti-shudder durability which is desired by Japanese and Korean automakers.

Castrol Transmax® J meets the requirements of the Japanese JASO 1A standard for automatic transmissions and is also approved by GM and Ford for use in all applications requiring a DEXRON®-III or MERCON® approved ATF. Consistent frictional properties improve driver comfort. Very long antishudder durability for comfortable gear changes without noise, vibration or harshness.

For the anti-multivehicle and anti-universal ATF crowd(4mb download):
http://epubl.luth.se/1402-1544/2005/28/LTU-DT-0528-SE.pdf
More recently, the International Lubricant Standardization and Approval Committee (ILSAC) ATF
subcommittee has started work on comparing and merging the different standards since it has been
demonstrated that it is possible to formulate fluids that comply with both the American and the Japanese
standards.................
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