Aisin ATF

[HBarlow]

Six months or so ago when I changed the ATF in my '08 3500 C&C I searched and found that Mobil Oil refined, bottled, and sold a product meeting Aisin specs for use in our automatic transmissions. Of course, I could have purchased the product at my "friendly" local Dodge dealer for $12/qt.

The correct product a few months ago was Mobil ATF 3309 indicating the product met JWS-3309 which is the specification that appears on the MOPAR ATF for Aisin six speed automatics. I bought it at a local Autozone store for abou $8/qt.

Last week I went into Lubbock to an Autozone store and found they no longer sell Mobil ATF 3309. That store had a couple bottles of Mobil Multiple-Vehicle ATF but it did not list JWS-3309 specs.

I spent a couple of hours on the internet and telephone the following day sending e-mails and ultimately talking to a Mobil engineer. The Mobil engineer told me that around August 2008 they reformulated Mobil Multi-Vehicle ATF so that it now meets the Aisin spec JWS-3309. They stopped bottling Mobil ATF 3309. Note that older stock does not meet JWS-3309. The JWS-3309 spec must be printed on the label on the backside of the jug to be compatible.

Today I went back to Lubbock to another Autozone store and found 15 quarts of Mobil Multi-Vehicle ATF. I bought 12, don't remember how many quarts a fluid change requires, but better to have a few quarts on my shelf rather than not enough. Price at Autozone was $7.99/quart.