The latest on this situation confirms that there was no Gentleman's agreement in place (From:
https://www.motorsport.com/f1/news/m...trigue-946251/ ):
The latest move came in July, when the FIA informed teams that any new engine introduced from the Italian GP would be allowed a maximum consumption of 0.9 litres of oil per 100km.
However, engines brought in before then would be allowed to use up to 1.2 litres per 100km, handing an advantage to anyone able to get engines ready before Italy.
Mercedes duly introduced its fourth and final power unit of the campaign in Belgium, prompting intrigue about whether or not the timing was related to the Monza oil burn limit.
It is understood that Ferrari in particular was not happy with the situation, because it had been under the impression Mercedes would not introduce a new engine in Belgium, so was caught by surprise.
"Suggestions that there had been some form of gentleman's agreement between Mercedes and Ferrari not to introduce an engine in Belgium are understood to have been wide of the mark, however, with sources at both outfits confirming that there had been no discussion between the teams about the matter."
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