Before the last two races of the season, only four drivers still did not use more than the allowed three engines per season - we bring you an overview of the use of all elements of power units ahead of the Saudi Arabian GP.

Red Bull and their engine supplier Honda are considering introducing a fifth internal combustion engine for Max Verstappen who is battling Lewis Hamilton for the championship, but will only decide on that when they arrive in Saudi Arabia.

Lewis Hamilton will receive a five place grid penalty for changing the engine at the Brazilian GP after Mercedes opted for the fifth V6 engine ahead of the rest of the season.

Lewis Hamilton will receive a 10-place grid penalty at the Turkish GP for taking a fourth V6 engine, Mercedes confirmed during the first free practice session in Istanbul.

Valtteri Bottas will get new elements of the Mercedes power unit which will give  him a penalty at the start of the Russian Grand Prix which he will start from 17th place after being seventh in the qualifying.

Before 15th race of the championship in Russia, we bring an overview of the power unit elements usage prior to the last quarter of the season - all drivers are on the third or fourth engine, which means that they face possible penalties for new engines.

Valtteri Bottas will start Sunday’s race for the Italian Grand Prix from last place after Mercedes decided to give him a fourth power unit to avoid penalties in any of the remaining races while he will retain the first starting position for the sprint qualifying he earned with his best time in qualifying.

All drivers used a maximum of three engines and most of the other available components, which means that in the last nine races of the season, any failure will be very expensive - we bring an overview of the use of power unit elements prior the 14th race of the season in Italy.

Max Verstappen and Sergio Perez have been forced to use fourth engines this season after Honda had to write off their second engines while a quarter of drivers have already taken the third and last engine - we bring an overview of power unit elements use ahead of Belgian GP.

George Russell is the only driver on the third of three engines allowed this season, although not even half of the races have passed, while Alpine drivers Fernando Alonso and Esteban Ocon used more than half of the allowed exhaust systems.