Recent Topics
S&W Internal Lock
by Doog
2 minutes 32 seconds ago
Anybody ever use Gunbroker?
by Doog
9 minutes 21 seconds ago
Idemitsu 0w20
by lawman1909
14 minutes 50 seconds ago
Shell Rotella Rebate is a joke...
by mrausch82
51 minutes 56 seconds ago
by Yannick
Today at 11:45 AM
Mobil1 High Mileage NOT ILSAC GF-5 compliant
by Luisraul924
Today at 10:58 AM
Sludged, oil didn't drain with plug removed
by Brybo86
Today at 10:48 AM
Alkalizing oil and detergents
by Gokatta
Today at 10:46 AM
2015 Ford PSD | MC SD 10W-30 CJ-4 | 1,570 Miles
by 2015_PSD
Today at 10:38 AM
Free Car
by tojo1968
Today at 10:10 AM
First motor oil on Mars will be?
by 285south
Today at 10:00 AM
'98 Tacoma V6 - Old Oil WAY Overfilled!!
by Turk
Today at 04:58 AM
Newest Members
Barry009, johnrore, dumboil, Sigeddy, Yosef
55670 Registered Users
Who's Online
94 registered (4ever4d, aircooled, andersd, AirgunSavant, 440Magnum, AlaskaMike, 3 invisible), 1698 Guests and 135 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
55670 Members
66 Forums
238968 Topics
3859883 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#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 ?

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 -
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 -
"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)

#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):
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
Those who say it cannot be done, should not interrupt the person doing it.
Your automaker lied!
Is this a spelling/grammar forum or BITOG?