Suspicions by the FIA regarding a potential technical breach arose after this year's Spanish Grand Prix, when the sporting authority believed that some teams might have been collecting and storing fuel beyond the flow meters in order to gain a power advantage.
But no team was found guilty of exploiting such a system, which subsequently lead the FIA to focus on oil systems and the potential use of performance enhancing chemicals which may have been added to the mix.
In a report released by the FIA and seen by F1i, the authority confirmed that neither team were practicing what they were suspected of.
"From these results, it can be concluded that the auxiliary oil tank is not being used to add performance-boosting components, either to the main or to the combustion chamber via the sump breather into the air intake."
Click here for FIA President Jean Todt's thoughts on the current state of F1