CHARLOTTE, N.C. -- NAPA Auto Parts said Thursday it will end its multimillion-dollar sponsorship of Michael Waltrip Racing at the end of the year, the latest fallout from the team's attempt to manipulate a race to get Martin Truex Jr. into NASCAR's version of the playoffs.

NAPA is Truex's primary sponsor and in the first year of a three-year extension announced last August. The deal ran through the 2015 season and is believed to be worth at least $15 million a year.

"NAPA believes in fair play and does not condone actions such as those that led to the penalties assessed by NASCAR," NAPA said in a statement. "We remain supportive of the millions of NASCAR fans and will evaluate our future position in motorsports."

The company issued a harsh rebuke of MWR last week after NASCAR sanctioned the organization for its shenanigans in the Sept. 7 race at Richmond. MWR was punished for deliberately manipulating the outcome of the race in an attempt to get Truex into the 12-driver Chase for the Sprint Cup championship field.

NASCAR took the unprecedented step of kicking Truex out of the Chase in favor of Ryan Newman, who would have made it into the field instead of Truex without MWR's meddling. MWR was also fined $300,000, general manager Ty Norris was suspended indefinitely and all three crew chiefs for its drivers were placed on probation for the rest of the year.

The penalties levied against MWR led to a larger NASCAR investigation that uncovered at least one other case of race manipulation. NASCAR was then forced to expand the Chase field to 13 drivers to include Jeff Gordon and issue new rules banning digital radios and more than one team member per car on the spotter stand.

NASCAR chairman Brian France also ordered all competitors to give 100 percent at all times during a meeting in which it was made clear attempts to artificially alter the outcome of races would be prohibited.

Waltrip apologized for the first time for MWR's actions at Richmond.

"To the fans and those who made their voice heard through social media, as the owner, I am responsible for all actions of MWR," he said in a statement. "I sincerely apologize for the role our team played and for the lines NASCAR has ruled were crossed by our actions at Richmond. NASCAR met with the competitors in Chicago and we all know how we are expected to race."

Aaron's, sponsor of Brian Vickers for MWR, said it remains dedicated to the organization, but Clint Bowyer sponsor 5-Hour Energy said Thursday it was still evaluating its relationship with MWR.

NAPA's decision will end a relationship with Waltrip that dates to 2001. NAPA was sponsor for Waltrip for both of his Daytona 500-winning cars and moved with him when he formed Michael Waltrip Racing in 2007. The company took over sponsorship of Truex when he joined MWR in 2010 and as Waltrip's replacement.

This is the second scandal NAPA has been through with Waltrip, who was found to have a fuel additive in his engine in his debut race, the 2007 Daytona 500.

NASCAR docked the team 100 points, ejected crew chief David Hyder and executive Bobby Kennedy and fined Hyder $100,000 in one of the biggest cheating scandals ever at the Daytona 500. It was also Toyota's debut race. Waltrip had a miserable season that year, failing to qualify for 20 races with NAPA as his sponsor and nearly going bankrupt.

He recovered, in large part, after MWR co-owner Rob Kauffman pumped in much-needed cash and brought stability and accountability to the organization.

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

More From KSOO-AM / ESPN Sioux Falls