Mercedes' Lewis Hamilton will start from the back of the grid at Sunday's Belgian Grand Prix after using yet another fresh power unit for second free practice.
The championship leader had already been dealt a 15-place penalty ahead of FP1, but was slapped with a repeat dose following further changes for the second session.
Hamilton's sanction should open the door for team-mate Nico Rosberg - 19 points behind the Briton in the battle for the F1 world title - and the German went fastest in Friday's first practice session.
Rosberg, also using a new power unit but not facing a penalty as he has not exceeded his quota of five, laid down a marker by clocking a quickest lap of one minute 48.348 seconds.
Hamilton was 0.730secs off the pace in that session, but it was the Red Bulls of Max Verstappen and Daniel Ricciardo that dominated FP2.
With Hamilton ending the session down in 13th and Rosberg sixth, Verstappen set the pace by posting a lap of of 1:48.085, 0.256secs ahead of his team-mate.
Soaring temperatures proved problematic for a number of drivers, with Rosberg and Hamilton among those to report issues with their tyres as a result.
Force India's Nico Hulkenberg finished third in FP2, with Sebastian Vettel, who went off at Les Combes at one stage, fourth.
Pascal Wehrlein put in an impressive performance to go 11th fastest in the Manor.