Ferrari's upturn in performance in 2015 has in part been made possible by improvements to its fuel and lubricants, according to supplier Shell.

Ahead of the 2015 Formula 1 season finale, the Abu Dhabi Grand Prix, Ferrari will end the season second in the constructors' standings having made a substantial step forward over its 2014 with the new generation V6 Hybrid power units.

Indeed, with Mercedes suggesting Ferrari's engine is almost a match for its power unit, the Italian team says a sizeable portion of the gains have come from fuel partner Shell alone.

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"It was always our plan to adopt a more aggressive strategy in 2015 with the development of our Shell V-Power race fuel in comparison to previous years," said Shell Innovation Manager Guy Lovett. "We really applied our learnings from 2014, a year of new and innovative hybrid technology, to our 2015 race fuel, of which we introduced five new powerful blends.

"We worked closer than ever with our colleagues in Maranello where we fully integrated our development plans to optimise the fuel-engine package and it was great to see that our hard work paid off, helping to power the team back to winning ways. Now the hard work continues ahead of 2016."

"2015 was a really positive year for Scuderia Ferrari and we made great strides in performance, particularly with the power unit, compared to last year," added James Allison. "The considerable improvements Shell made with its Shell V-Power race fuel and Shell Helix Ultra with PurePlus Technology lubricant really did contribute to our own improvements on the race track, not only helping to deliver greater horsepower but reliability as well.

"Our Technical Partnership with Shell has never been stronger and we look forward to continuing our work with them for at least the next five years with the aim of winning more races and championships."