Both Mercedes drivers in top 3 splitted by Ferrari's Vettel.
German edges his teammate by one tenth, both Ferrari behind them with Raikkonen in P3. Teams were working through their tyre programs.
Ferrari ends the session 1-2 with Williams' Bottas in third.
Force India continues to pay the price for the late completion of the VJM08, and until the aero update package arrives in Austria Nico Hulkenberg and Sergio Perez are set to be fighting to get out of Q1.
Two-stop strategies for the majority of drivers, with other variations further down the field
Sahara Force India looks ahead to round three of the 2015 Formula One season in Shanghai.
Sergio Perez and Nico Hulkenberg finished in P13 and P14 respectively.
Sebastian Vettel managed to pipe both Mercedes drivers being on better tire strategy. Second Ferrari of Kimi Raikkonen is in fourth.
Sahara Force India survived the rain storms in Sepang today.
Robert Fernley: "We obviously still have a lot of work to do ahead of qualifying, but from a learning perspective we’ve achieved a lot today.”
Sergio Perez: "Malaysia is a very special place for me. It is where I got my first podium in Formula One..."
Nico Hulkenberg racing to seventh place and Sergio Perez picking up the final point in tenth.
Vijay Mallya: "To have Nico and Checo within a thousandth of a second of each other shows that they really pushed the car to its limit."
Nico Hülkenberg: "With almost 50 laps today I think we are quite well prepared going into the weekend."
Team hopes that reliable testing performance is a pointer towards a strong display in Melbourne this weekend.