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According to Brotzu – Caso – Cosolo, Dimensione Cielo, Aerei Italiani nella Seconda Guerra Mondiale, vol. 3, Caccia Assalto, Rome, 1972, page 33 «*The DB's of the aircraft [i.e the bi-motor Ro. 58 at its maiden flight] are not those excellently license-built by Alfa Romeo and capable of developing up to 50 HP more than the original DB. They are instead old and worn out German built engines, which have only undergone a refitting...*»
During the Battle of Alam Halfa the Italians were astonished of the sudden appearance of MG 42 whose existance was kept strictly secret by the Germans to the Italians; the Italians repayed with the same money denying the plans of the Class R submarines when the Germans asked for them (a specialized cargo submarine) that were desperately needed by the Germans to go to the Far East to import rare metals, rubber, morphine etc.....