The Mitsubishi team first tested Mobil 1 in 2004, and recorded a power increase from their engine without changing any engine parts. The improved performance of the Lancer 05 WRC Rally car is in part due to a new engine for which the team tested a variety of Mobil 1 formulations. Supplying samples of rally-proven motor oils to ExxonMobil technicians for post-event analysis has allowed Mitsubishi to identify the optimum formulation of Mobil 1 for the WRC 05. The team requires a motor oil that delivers increased performance without affecting engine reliability - a key factor in 2005 with the introduction of a two-rally rule for engines (requiring a single engine to last two championship rounds). "A technology partner like ExxonMobil is a vital component to any successful WRC team," said Isao Torii, Head of Motorsport, Mitsubishi Motors. "Our tests revealed Mobil 1 products deliver a performance and reliability boost in a variety of conditions and temperatures. Our cars perform better, for longer, using Mobil 1."