I did a partial flush of the wife's car ('05 Subaru Legacy, 4 speed auto) several months ago, and used Castrol Multi-Vehicle ATF. I used it since it said it was compatible with Dexron III and Nissan Matic-J, which is what her car is happy with. I was surprised to find that now they have the import and domestic varieties, because I put it an ATF cooler this weekend, and changed the filter and fluid while I was at it. I'm guessing the import and the older stuff are not significantly different since they both meet Dex III and Matic-J, but should they mix OK?