MONTMELO, Spain (AP) -- Lewis Hamilton put Mercedes at the top of the timesheet for a second straight day of Formula One preseason testing on Saturday.
The defending F1 champion steered his way late in the day to a session-best lap of 1 minute, 23.022 seconds -- a day after teammate Nico Rosberg had been the quickest on the Barcelona-Catalunya circuit.
While Mercedes fine tuned its car to prepare for a title defense, McLaren's reliability problems returned. An oil leak ended reserve driver Kevin Magnussen's day 1 ? hours early after he had managed a session-low 39 laps.
Favorable conditions provided for a second straight day of productive driving for most teams, with seven of the nine drivers breaking the 100-lap mark.
Testing concludes Sunday.