A minor spat has broken out between Renault teammates Robert Kubica and Vitaly Petrov.
Last month, F1's Russian newcomer Petrov criticised Pole Kubica for giving him a cold welcome to the sport in 2010.
"You can't learn anything from him because he's a closed person," alleged Petrov.
The teammates came together on Monday as their car for the 2011 season, the black and gold R31, was unveiled in the Valencia pitlane ahead of this week's testing.
"I don't want to get too much into the details," Kubica answered when asked about Petrov's comments about him.
He then fired a barb at Petrov by joking that he learned something from the Russian last year.
"(I learned) how not to go off the track. I'm joking," Kubica quipped.
Team boss Eric Boullier also refused to endorse Petrov's comments, arguing that it is not Kubica's responsibility to mentor a rookie.
"That is one of the many subjects that we have discussed with him (Petrov), that if he wants to deliver he has to find it by himself," Boullier, who procrastinated before signing Petrov's new two-year deal, is quoted by Reuters.