DAYTONA BEACH, Fla. — The Daytona 500 is supposed to be a NASCAR celebration. A cheating scandal has made it a mockery.

Five teams have been busted for breaking the rules, including two-time winner Michael Waltrip, who humiliated Toyota by flagrantly violating the code of NASCAR's garage in the Japanese automaker's debut.

Waltrip lost two key crew members Wednesday when NASCAR penalized his team for using a fuel additive in preparation for the Super Bowl of racing. It continued a weeklong crackdown on cheating by a sanctioning body fed up with teams' continued attempts to flout the rule book.

"It's been rough on everybody; we're here to celebrate a race," said NASCAR competition director Robin Pemberton. "Instead, we're busy dealing with all of this."

Waltrip's crew chief and team director were suspended indefinitely after a fuel additive was found during inspection. But Waltrip, docked 100 points, will be allowed to participate in today's races that determine the field for the 500.

David Hyder, his crew chief, was thrown out of the garage and fined $100,000 — the largest monetary fine in NASCAR history. Team director Bobby Kennedy also was kicked out.

Waltrip said he was "so sad and embarrassed," but tried to shift blame to an unidentified individual within his team.

"This is not the action of an organization, a manufacturer or a sponsor," Waltrip said in a statement. "This was an independent act done without consent or authorization from me or any of my executive management team."

The scandal rocked the Toyota group, which now is wondering whether it aligned itself with the right people.

"We will have some further discussions with that team and decide what our relationship is going to be in the future," said Lee White, general manager of Toyota Racing Development, even before NASCAR announced the penalties. "We hold our own people to a very high standard, and certainly we hope that we've partnered with the right people."

Waltrip's penalties came one day after the crew chiefs for 2003 champion Matt Kenseth, Kasey Kahne, Scott Riggs and Elliott Sadler all were suspended. All five drivers also were docked points in an unprecedented move by NASCAR, which never before had taken points before the season.