Carchex  has signed Dale Earnhardt Jr., one of the biggest names in NASCAR, to an endorsemenst deal beginning this weekend at the Daytona 500.

Earnhardt Jr. will appear in advertising, marketing and on the Web site of the Hunt Valley provider of extended car warranties.

Carchex’s logo will appear on Earnhardt Jr.’s No. 88 Chevrolet, for the entire 2010 NASCAR Nationwide Series. Financial terms of the associate sponsorship deal were not disclosed.

The No. 88 Chevrolet, managed by JR Management Enterprises, Earnahrdt’s racing management company, will most often be driven by Kelly Bires. Earnhardt Jr. will also drive the No. 88 Chevy for select Nationwide Series events, including this week’s race at Daytona International Speedway.

The Carchex logo will also appear on team haulers and uniforms during Nationwide Series Race events. Earnhardt Jr. is Nascar’s seven-time Most Popular Driver and winner of more than 40 Nascar-sanctioned races.