McLaren F1 driver Fernando Alonso has been quick to criticise the Honda engine over the past season.
The engine has given the team repeated reliability issues, and the Spaniard has not been shy with his criticisms, sending regular and critical radio messages.
Yusuke Hasegawa, Honda's F1 boss, spoke candidly about Alonso and the engine's failings to Spanish paper El Confidencial, as per PlanetF1.
"Alonso always came to put pressure on me.If the car was going badly, he had no qualms about telling me he was not happy. He's a good person, he probably felt very ashamed of having to scold me but he had to do it.
"After all, he wanted everything to be all right, that's why I'm so ashamed."
Hasegawa struck a professional attitude to the Spaniard's frequent criticisms.
When asked whether or not he took personal offence at Alonso's words, Hasegawa said: "No, not at all. Alonso criticised us because he was not satisfied, he had every right to do it."
Certain members of Team Honda were not so placid about the Spaniard's frequent remonstrations, however.
"Obviously, there are people at Honda who were not happy with Alonso's attitude. But for me it was not a problem.
"From a professional point of view, there have been many problems because he was never happy and it is very difficult to establish a good working relationship.
"The drivers, after all, are very emotional guys and you have to understand them when they behave like that. If we had the best car, would not Alonso be happy?"
"Yes, that's why we can not complain."
It's likely that part of Alonso's decision to stay on at McLaren was the team's move to break with Honda at the end of the season. Renault will now provide McLaren with engines moving forward.
Honda, with Hasegawa at its head, will partner with Italian Formula 1 team Scuderia Torro Rosso ahead of the 2018 season.
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