SLF

SLF are initials that may refer to:

2009 Superleague Formula season

The 2009 Superleague Formula season was the second Superleague Formula championship. The series was rebranded the "Superleague Formula by Sonangol" for this season and also 2010 with the Angolan oil company becoming the title sponsor. It began on June 28 at Magny-Cours and finished on November 8 at Jarama.

The field remained at 18 clubs for the 2009 season but Beijing Guoan did not return to try to retain the title which they won with Davide Rigon in 2008, however Rigon did return in the car of Olympiacos CFP despite GP2 commitments. In Estoril, María de Villota became the first woman to race in the series and Sébastien Bourdais became the most successful racing driver to enter the series having been dropped by Scuderia Toro Rosso just weeks earlier. Bourdais described Superleague as "the best alternative to F1".

Liverpool F.C., run under Hitech Junior Team with driver Adrián Vallés, were crowned series champions for the first time at the last event of the season.

2010 Superleague Formula season

The 2010 Superleague Formula season was the third Superleague Formula championship. The series was rebranded "Superleague Formula by Sonangol", due to a two-year deal that began in the previous season. The first race of the season was on 4 April at Silverstone and it finished on 24 October at Navarra after a series record of 12 race weekends in all.

The series' prize fund was increased to €5 million, with the championship-winning team winning €1 million. Superleague Formula teamed up with The NewsMarket to distribute video content to 25,000 global media outlets in over 190 countries throughout the season. Ex-Formula One and WTCC driver Tiago Monteiro praised Superleague Formula by saying he was "pretty impressed with what they've done so far".

R.S.C. Anderlecht, run under Azerti Motorsport with driver Davide Rigon, were made champions, but only after the last Super Final of the last event of the season. It was R.S.C. Anderlecht's first series title but the second for Rigon, who won the title with Beijing Guoan in 2008.