I have read on three sources that in this race, Juan Manuel Fangio pitted for rain tyres on lap 61 and came out behind the Ferraris. Ferrari then lodged a protest against the pitstop, saying that more than the three permitted mechanics had worked on the car, so ordered their drivers to slow and Fangio passed Farina for victory. The protest was not upheld and Fangio kept his victory.
Is any more information known about this race? Was the protest not upheld because Ferrari had been wrong to think there had been more than three mechanics, because they were wrong about the existence of this rule, or because the organisers not following their own rules and Fangio should have been disqualified?