The former Argentina international joined United from West Ham in 2007, where he had been involved in a dramatic battle to avoid relegation from the Premier League.
Before then, he had played in Argentina and Brazil, but said he soon realised that the culture at United was on a different scale.
"At West Ham, we saved ourselves from relegation on the final day of the season with a victory over Manchester United at Old Trafford," he told ESPN Argentina. "It wasn't the same at Manchester United as at Boca.
"I missed at penalty at Boca and they killed me, this didn't happen at United.
"Even the worst player came with a Ferrari. I was there with an Audi which the club had given me and they all laughed at me.
"'Take the Lamborghini,' Rooney told me. I went to find it at his house and he let me keep it for 10 days."
Tevez also said he felt he had a lot in common with Rooney given their backgrounds, while he also had special words for Paul Scholes.
"I identified a lot with Rooney," he added. "He came from a poor area in Liverpool and always fought for the ball as if it were the last.
"Scholes was one of the best I players I've seen. That shot he had."
Tevez spent two seasons at United and won two Premier League titles, a League Cup, a Champions League and FIFA Club World Cup before leaving to join rivals Manchester City in 2009.