The error in weight has been attributed to excessive tyre wear caused by the teams having to run on intermediates as opposed to the well-rehearsed runs on dry/grooved tyres.
In a statement, the stewards had this to say:
The Stewards accept that the fact of the car being underweight was entirely inadvertent and give credit to BMW Sauber F1 Team for their assistance and cooperation in dealing with this matter.
The reason for the car being underweight was explained as being attributable to excessive and unexpected tyre wear (and therefore weight loss) arising through continued use of wet weather tyres in comparison to the accustomed and anticipated rate of wear for dry tyres.
It is the Stewards’ view that the car did not comply with Article 4.1 of the 2006
FIA Formula OneTechnical Regulations.
The Stewards’ decision is that the car be excluded from the results.
The disqualification of Robert Kubica promotes