I have found anything but the Losi diff grease is better than the kit stuff. Many people have mentioned Team Associated is very good for this car but I did recently try Schumacher diff grease because I had some kicking around and so far so good. After about 3 race meetings, the rear is still pretty smooth. When using the Losi stuff, I found I was rebuilding it after every meeting even after breaking it in nicely.
I do think a lot of people are suffering with the rear diffs on this car especially here in the UK with the high bite astro tracks.
Simon
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