LE CASTELLET, France -- Lewis Hamilton will find out on Friday whether Mercedes is able to deliver its latest specification of engine at this weekend's French Grand Prix.
The upgrade was originally planned for the Canadian Grand Prix but was delayed after dyno testing threw up some reliability concerns back at the team's engine base in Brixworth. Mercedes has arrived in France with the option of running either the upgrade or a fresh version of the original 2018 specification used at the first seven races and will make a decision on which one to use on Friday.
Because drivers are limited to three engines per season this year, manufacturers attempt to introduce upgrades when fresh engines are fitted.