MBNA Corp. plans to pump more octane into its platinum card promotions by sponsoring more auto races in its home state.

The company will become the title sponsor of two races at Dover Downs International Speedway in Delaware. The races will be sanctioned by Nascar, the National Association of Stock Car Auto Racing. Terms of the agreement were not disclosed.

One weekend next spring the card issuer will sponsor a Winston Cup race called the MBNA Platinum 400 and a Busch Grand National race called the MBNA Platinum 200. It already sponsors Dover's September events, the MBNA Gold 400 and MBNA Gold 200.

MBNA's Nascar MasterCard affinity program has attracted 400,000 customers since 1993, a company spokesman said.

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