Shell Oil Company and Penske Corporation have announced a business alliance to increase their motor sports presence in the 2011 racing season, extending sponsorhsip to former champion Kurt Busch, who has driven the No. 2 Miller Lite Dodge since 2006.

As a result, rival company ExxonMobil fired back by announcing that it is also cutting ties with Penske after this season. Its withdrawal means Penske has to look for a new sponsor for Sam Hornish Jr., driver of the No. 77 Mobil 1 Dodge.

“It has been a long and successful relationship, and we wish the Penske team continued success on the track,” the ExxonMobil said in a statement as reported by the Associated Press.

Penske’s deal with Shell will make Pennzoil the primary sponsor for Busch, who will move to the No. 22 Dodge, according to the news provider.

In a new release, Penske said that Pennzoil will become the “official motor oil” of its racing season next year, including all of its entries in the NASCAR Sprint Cup, the Nationwide Series and the IZOD IndyCar Series.

Penske first partnered with Pennzoil in 1983 as part of its IndyCar teams. The partnership won the 1984 and 1988 Indianapolis 500 Mile Races. Busch also drove a Pennzoil-supported car for another team when it won the NASCAR Sprint Cup Series Championship in 2004.