The legality of Ferrari’s 2018 car remains under the spotlight.
There are suspicions not only about the amount of oil consumed by the turbocharger, but also whether Ferrari is cleverly getting around the rule limiting battery power.
Rumours in Monaco suggest the FIA is monitoring the car at Monaco this weekend with additional hardware, and also that new energy management software may be in use for a similar purpose.
“There have been rumours that people are cottoning onto,” Red Bull boss Christian Horner said.
“I’m sure the FIA has all the competence to be able to measure, administer and look at the car that’s presented for scrutinising during a grand prix weekend and it is the team’s obligation to ensure that happens,” he added.