FIA clears top teams over oil systems

The FIA has cleared top teams Mercedes and Ferrari following concerns about the teams' respective oil systems.

La Gazzetta dello Sport claimed samples were taken from the cars raced by Lewis Hamilton and Sebastian Vettel in Canada.

"A detailed analysis of the viscosity and texture of the samples showed no abnormalities", said correspondent Marco Gentili, explaining that it was suspected additives were being introduced to increase performance.