I too have noticed that in my 2000 C230 it is a bit harder to maintain a straight line in a crosswind. I have the stock 205 55 16 Continentals on it and I think that they may be part of the problem. It acts like there is too little castor in the alignment. I have not had it above 95 MPH yet but at 80 it was very nervous and required much more attention than my 88 300E. With only 8K miles I don't believe that wear is a factor. I will probably put XGTs or MXV4s on it when the time comes, maybe that will help.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 67K
2016 E550 Cabriolet 48K