After completing over 6,000 kms of reliable running in pre-season testing , the problems came as a surprise .
After completing over 6,000 kms of reliable running in pre-season testing , the problems even led to some fans accusing Mercedes of giving Nico Rosberg preferential treatment .
After completing over 6,000 kms of reliable running in pre-season testing , the problems came as a surprise and even led to some fans accusing Mercedes of giving Nico Rosberg preferential treatment .