Penske parts company with Kurt Busch

A team statement said it had reached a "mutual agreement" with the 33-year-old, whose position had been under pressure since he was caught on camera making an obscene gesture in his car at the NASCAR season finale at Homestead, and then later being filmed by a fan while verbally abusing a member of the media.

"I appreciate the victories that Kurt has brought Penske Racing and our sponsors over the past six years," said team owner Roger Penske in the statement.

"While I am disappointed that Kurt will not be racing for our team in the future, both Kurt and I felt that separating at this time was best for all parties, including our team and sponsors. I wish Kurt the best in his future racing endeavors."

Busch said that he hoped to be able to make a fresh start.

"I am grateful to Penske Racing for six very productive years," said the 2004 NASCAR Sprint Cup champion.

"Together we won a lot of races -16 in all. Leaving a great organisation and a lucrative contract is not easy, but it's an important step for me and allows me to take a deep breath to work on things that can make me a better driver and a better person. I want to personally thank Roger Penske for the opportunity that he has given me."

Penske said that it is now investigating its options for the driver of its #22 entry.