Seven teams have written a letter to governing body the FIA demanding answers to a series of questions on the Ferrari engine controversy.
The letter is confidential but BBC Sport can reveal it contains an extensive list of queries about a confidential settlement the FIA has reached with Ferrari.
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The letter includes a deadline by which the teams have demanded the answers.
It was signed by the same seven teams who on Wednesday issued a collective statement expressing their "strong objection" to the deal between the FIA and Ferrari, saying they would "pursue full and proper disclosure" and "reserved [their] right to seek legal redress".
The teams are Mercedes, Red Bull, McLaren, Renault, Racing Point, Alpha Tauri and Williams. The only teams not to sign it are Ferrari and their engine customers Alfa Romeo and Haas.
The seven have declined requests by BBC Sport to share the contents of the letter, which was addressed to both the FIA and commercial rights holder the F1 Group. But the teams are known to be concerned about a number of topics, including:
- why the FIA felt it was unable to prove its doubts about the Ferrari engine's legality
- why the settlement it reached was confidential rather than communicated more widely
- whether the integrity of the finishing order of last year's championship should be questioned
- what the FIA's failure to get to the facts on the question of the engine's legality says about the governing body's ability to police the sport's technical regulations