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You'll get lots of opinions and recommendations to that question and I don't think any one "best" can be singled out. There are a bunch of different brands that will take care of business just fine as long as it's non friction modified so it doesn't mess with the wet clutch. The manual calls for a 10w 30 motor oil. Personally I've always used Belray. This comment will probably stir things up but in my opinion (and that of my tranny guy Mark @ R&D Motorsports) I wouldn't use ATF fluid.