Ross Brawn has suggested he left Mercedes because he could not trust current bosses Toto Wolff and Niki Lauda.
Former team principal Brawn played a key role in Mercedes becoming the dominant force in Formula One, but left in 2013.
The 61-year-old has not returned to the sport and claims difficult relationships with head of Mercedes-Benz motorsport Wolff and non-executive chairman Lauda resulted in him leaving his post.
In his forthcoming book 'Total Competition', Brawn says: "What happened at Mercedes is that people were imposed on me who I couldn't trust.
"I never really knew what they were trying to do. I mean Niki would tell me one thing, then I would hear he was saying something else.
"I was beginning to deal with people who I didn't feel I could ultimately trust; people within the team, who had let me down already in terms of their approach.
"Then in early 2013, I discovered [technical director] Paddy Lowe had been contracted to join the team and it had been signed off in Stuttgart.
"When I challenged Toto and Niki, they blamed each other. I met them to have it out with them. And they both pointed to each other.
"I think one complication in all of that was Toto and Niki became shareholders, which was an interesting decision by Mercedes. I never really understood it.