PARIS (Dispatches) - The Woking-based team’s supplier Renault introduced its more powerful engine for Daniel Ricciardo at last weekend’s French Grand Prix, with his teammate not getting it because the French car manufacturer wanted him to avoid a grid drop.
But with this weekend’s race in Austria putting a premium on horsepower, McLaren says it is now weighing up what it does – because the situation is not so clear cut.
Team principal Andreas Seidl said: "It is still something we are working out at the moment. We have to collect the data again after France, and then we have to work out our plan.
"And especially what does it mean in terms of penalties until the end of the year with the different scenarios that are around.”
McLaren’s situation is complicated by the fact that Sainz has had to use an extra power unit already this year as a result of the MGU-K failure that he suffered at the season-opening Australian Grand Prix.
It means that if McLaren elects to hand him the B-spec he will have to take a grid penalty.
Seidl added: "As soon as Carlos is going for the upgrade then we get the penalty, because it is the fourth one. So we need to figure out now when we do that.
Seidl explained that McLaren chose not to run the B-spec in France because it felt that running it in Paul Ricard would virtually guarantee the need for another change later in the year.
"In the end, how the regulations are, you need to make a plan of how you’re going to use your engines throughout the season in terms of the modes, mileage and so on to avoid penalties,” he said.
"We got the engine delivered from Renault, which is good and encouraging to see that they keep bringing steps. But again the plan for us was that it was better not to use it yet, simply to minimise the number of penalties that we would get until the end of the season.”