How many drivers on the same Nascar team can compete in a race?

A Nascar owner can have up to four race teams competing in each race. Each race team will have a designated driver for that certain car number for that weekend.

There are teams that use multiple drivers throughout the season.

For example, Michael Waltrip Racing fields three cars, (#15 - Clint Bowyer), (#56 - Martin Truex Jr.) and (#55 - Mark Martin, Brian Vickers and Michael Waltrip).