Daniel Ricciardo will be running the older specification Renault power unit in this weekend's Abu Dhabi Grand Prix.
Following a disappointing race in Brazil with the latest spec engine, the Red Bull Racing stalwart expressed his disappointment with the improvements implemented by Renault, and which centered around the unit's combustion engine.
Extensive analysis of the Spec-B unit has convinced Renault and Red Bull that reverting to the A-spec would better serve the Milton Keynes outfit's interests at the Yas Marina track, with no imposed grid penalty as the unit has already been used.
Renault F1 managing director Cyril Abiteboul alluded to the manufacturer's dissolved partnership with Red Bull as part of the reasons why the power unit's improvements lacked a performance impact.
"It is true that recent history and uncertainty with Red Bull have loosened the technical collaboration that there was between our respective teams," Abiteboul commented.
"Our dialogue has almost stopped. It was only fair for next year, but maybe where we should have been a bit more careful was that it didn't stop for this year.
"It meant we were not maximising the performance improvement of that engine, because if you change one element of the power unit you need to think of the side effect of all the other elements of the power unit."
Unfinished business: the scores still to be settled in Abu Dhabi
Use the red tabs on either side of the screen to scroll through more Formula One news and features
Click here for exclusive pictures of the Ferrari power unit
Keep up to date with all the F1 news via Facebook and Twitter
Franco Colapinto’s management opted for an extraordinary defensive maneuver after the Alpine driver’s clash with…
F1 The Movie took a victory lap on Sunday evening at the 98th Academy Awards,…
German driver Hans Heyer was born on this day in 1943, and while his main…
McLaren endured a bitterly frustrating weekend at the Chinese Grand Prix as both of its…
Kyle Kirkwood delivered a masterpiece on Sunday in the shadows of AT&T Stadium, proving that…
While Max Verstappen continues to wage a verbal war against Formula 1’s 2026 regulations, Mercedes…