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May i ask how effective are these solution fixing shuddering problems on cvts?

Fix shuddering transmission (CVT) Xado EX 120

Link:

http://www.trademe.co.nz/Browse/Listing.aspx?id=757023677

Is it true what they claim to fix?

Many thanks in advance

According to an expert Automatic Transmission specialist we spoke to, this product introduces a high dose of friction modifier into the transmission. Accordingly, he says he has heard that it can cure start clutch shudder in CVTs - but NOT permanantly. In cases he's aware of, the shudder returns within a couple of thousand kms at the outside.
I guess like all "miracle cures", it's a patch-up job and the unsuspecting buyer of a car where products such as this are used can end up owning an expensive problem.