I am experiencing problems with my gear box.. The car (S320CDI 2008) jerks when it changes lower gear 1 & 2.. But irregular.. sometimes it's goes smooth and sometimes it jerks.. We test-drove the car many times and MB acknowledges that gearbox is jerking.. The gar has been back to different dealers.. had 4x software updates and oxygen sensor was changed.. but no improvement. Now MB is living in denial and telling me it's all according to "manufacturers specification" I am puzzled because for sure i am convinced something is not correct.. Anybody else has these problems?