Jean-Eric Vergne's Toro Rosso retires from the 2014 Monaco GP with a broken power unit.
In Italy, Daniil Kvyat became the first driver to take a 10-place grid penalty for using a sixth power unit element, in his case an ICE, or internal combustion engine.
The Russian’s troubles are not over, as he will now face a five-place penalty as soon as he uses a sixth example of any other element, and will get 10 places if uses a seventh ICE.
Meanwhile, with six races to go including Singapore, several other drivers are on the bubble, and face an inevitable penalty. Here’s the full list of those who are at five, preceded by a list of the abbreviations: