Jose Maria Lopez clocked the best lap time of the day in the final session of the official World Touring Car Championship test day at Vallelunga.
The Argentinian posted a 1m37.123s despite a green track, after showers hit the circuit for most of the day.
Fellow Citroen Racing driver Yvan Muller was second after setting his best time during the morning session, like the rest of the field.
As a result, Thed Bjork, who finished second in the first session, was down to third in his Volvo S60 at the end of the day.
Mehdi Bennani similarly ended fourth in his Sebastien Loeb Racing C-Elysee ahead of the other blue-liveried Volvo car with Fredrik Ekblom behind the wheel.
Norbert Michelisz came home sixth in the first of Castrol Honda Civic WTCC, followed by SLR teammates Gregoire Demoustier and Tom Chilton.
Rene Munnich completed the standings, ending the two-day test at the Italian circuit.
There were several incidents during the afternoon session, the most notable being Ekblom's off which damaged the bodywork of his S60.
Teammate Bjork also had a reliability problem, the Volvo refusing to start in the pitlane and, once it got going, soon came to a halt after Cimini.
A large puff of smoke came out of Michelisz's Honda during the last session when the car was restarted, forcing the team to end early.
Pietro Casillo / TouringCarTimes