Last update on. From the section Formula 1
Live coverage of the Turkish Grand Prix can be seen on 5 Live and BBC Sport.
After receiving a penalty for overusing engine parts, Lewis Hamilton will be demoted to 10th place at Sunday's Turkish Grand Prix.
Mercedes has taken a fourth piece - one more than allowed - in order to lower the risk of the Briton experiencing a failure during tight championship run-in.
He has only taken one power-unit component, the internal combustion engine. This allows him to escape a full grid drop.
Our goal is to lose as much ground as possible to Max Verstappen, our title rival.
Hamilton is now two points behind Hamilton after Hamilton recovered from his one-engine penalty and finished second to the Red Bull driver at the last race.
Hamilton won Friday's first practice at Istanbul Park with 0.425 seconds more than Verstappen. Ferrari's Charles Leclerc was third, and the second Mercedes-of Valtteri Bottas was fourth.
Mercedes has decided to replace the engine after Hamilton's failure in practice at last month's Dutch Grand Prix caused one of his engines to fail.
The fourth internal combustion engine will give them more comfort and overall performance for the championship run in.
The team made their decision based on simulations of the races ahead, trying to balance the negative effects of a penalty and the risk of reliability problems.
This was due to the fact that a grid penalty like this is much less severe than a failure at a race and a penalty at another one.
Mercedes stated that they needed only to change the internal combustion engine and not any other components, such as the turbo, hybrid, or battery, but it was sufficient.
Carlos Sainz from Ferrari, fifth fastest in the first practice, was already confirmed to have had a complete engine change. He will start at the back of grid.
Esteban Ocon's Alpine was 6th fastest from McLaren’s Lando Norris to Alpha Tauri’s Pierre Gasly to Verstappen.
Red Bull drivers both complained about a lackluster front grip throughout the session.
The track ran smoothly for the hour, with no incidents. It also had a lot more grip than last year when it was resurfaced after a decade break. Oils seeping from the bitumen had caused extreme slippage.